/* Copyright (c) 2001 Matej Pfajfar. * Copyright (c) 2001-2004, Roger Dingledine. * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson. * Copyright (c) 2007-2012, The Tor Project, Inc. */ /* See LICENSE for licensing information */ /** * \file or.h * \brief Master header file for Tor-specific functionality. **/ #ifndef _TOR_OR_H #define _TOR_OR_H #include "orconfig.h" #ifdef __COVERITY__ /* If we're building for a static analysis, turn on all the off-by-default * features. */ #ifndef INSTRUMENT_DOWNLOADS #define INSTRUMENT_DOWNLOADS 1 #endif #endif #ifdef _WIN32 #ifndef _WIN32_WINNT #define _WIN32_WINNT 0x0501 #endif #define WIN32_LEAN_AND_MEAN #endif #ifdef HAVE_UNISTD_H #include #endif #ifdef HAVE_SIGNAL_H #include #endif #ifdef HAVE_NETDB_H #include #endif #ifdef HAVE_SYS_PARAM_H #include /* FreeBSD needs this to know what version it is */ #endif #include "torint.h" #ifdef HAVE_SYS_WAIT_H #include #endif #ifdef HAVE_SYS_FCNTL_H #include #endif #ifdef HAVE_FCNTL_H #include #endif #ifdef HAVE_SYS_IOCTL_H #include #endif #ifdef HAVE_SYS_UN_H #include #endif #ifdef HAVE_SYS_STAT_H #include #endif #ifdef HAVE_NETINET_IN_H #include #endif #ifdef HAVE_ARPA_INET_H #include #endif #ifdef HAVE_ERRNO_H #include #endif #ifdef HAVE_ASSERT_H #include #endif #ifdef HAVE_TIME_H #include #endif #ifdef _WIN32 #include #include #include #include #define snprintf _snprintf #endif #ifdef USE_BUFFEREVENTS #include #include #include #endif #include "crypto.h" #include "tortls.h" #include "../common/torlog.h" #include "container.h" #include "torgzip.h" #include "address.h" #include "compat_libevent.h" #include "ht.h" /* These signals are defined to help handle_control_signal work. */ #ifndef SIGHUP #define SIGHUP 1 #endif #ifndef SIGINT #define SIGINT 2 #endif #ifndef SIGUSR1 #define SIGUSR1 10 #endif #ifndef SIGUSR2 #define SIGUSR2 12 #endif #ifndef SIGTERM #define SIGTERM 15 #endif /* Controller signals start at a high number so we don't * conflict with system-defined signals. */ #define SIGNEWNYM 129 #define SIGCLEARDNSCACHE 130 #if (SIZEOF_CELL_T != 0) /* On Irix, stdlib.h defines a cell_t type, so we need to make sure * that our stuff always calls cell_t something different. */ #define cell_t tor_cell_t #endif #ifdef ENABLE_TOR2WEB_MODE #define NON_ANONYMOUS_MODE_ENABLED 1 #endif /** Length of longest allowable configured nickname. */ #define MAX_NICKNAME_LEN 19 /** Length of a router identity encoded as a hexadecimal digest, plus * possible dollar sign. */ #define MAX_HEX_NICKNAME_LEN (HEX_DIGEST_LEN+1) /** Maximum length of verbose router identifier: dollar sign, hex ID digest, * equal sign or tilde, nickname. */ #define MAX_VERBOSE_NICKNAME_LEN (1+HEX_DIGEST_LEN+1+MAX_NICKNAME_LEN) /** Maximum size, in bytes, for resized buffers. */ #define MAX_BUF_SIZE ((1<<24)-1) /* 16MB-1 */ /** Maximum size, in bytes, for any directory object that we've downloaded. */ #define MAX_DIR_DL_SIZE MAX_BUF_SIZE /** For HTTP parsing: Maximum number of bytes we'll accept in the headers * of an HTTP request or response. */ #define MAX_HEADERS_SIZE 50000 /** Maximum size, in bytes, for any directory object that we're accepting * as an upload. */ #define MAX_DIR_UL_SIZE MAX_BUF_SIZE /** Maximum size, in bytes, of a single router descriptor uploaded to us * as a directory authority. Caches and clients fetch whatever descriptors * the authorities tell them to fetch, and don't care about size. */ #define MAX_DESCRIPTOR_UPLOAD_SIZE 20000 /** Maximum size of a single extrainfo document, as above. */ #define MAX_EXTRAINFO_UPLOAD_SIZE 50000 /** How long do we keep DNS cache entries before purging them (regardless of * their TTL)? */ #define MAX_DNS_ENTRY_AGE (30*60) /** How long do we cache/tell clients to cache DNS records when no TTL is * known? */ #define DEFAULT_DNS_TTL (30*60) /** How long can a TTL be before we stop believing it? */ #define MAX_DNS_TTL (3*60*60) /** How small can a TTL be before we stop believing it? Provides rudimentary * pinning. */ #define MIN_DNS_TTL 60 /** How often do we rotate onion keys? */ #define MIN_ONION_KEY_LIFETIME (7*24*60*60) /** How often do we rotate TLS contexts? */ #define MAX_SSL_KEY_LIFETIME_INTERNAL (2*60*60) /** What expiry time shall we place on our SSL certs? */ #define MAX_SSL_KEY_LIFETIME_ADVERTISED (365*24*60*60) /** How old do we allow a router to get before removing it * from the router list? In seconds. */ #define ROUTER_MAX_AGE (60*60*48) /** How old can a router get before we (as a server) will no longer * consider it live? In seconds. */ #define ROUTER_MAX_AGE_TO_PUBLISH (60*60*24) /** How old do we let a saved descriptor get before force-removing it? */ #define OLD_ROUTER_DESC_MAX_AGE (60*60*24*5) /** Possible rules for generating circuit IDs on an OR connection. */ typedef enum { CIRC_ID_TYPE_LOWER=0, /**< Pick from 0..1<<15-1. */ CIRC_ID_TYPE_HIGHER=1, /**< Pick from 1<<15..1<<16-1. */ /** The other side of a connection is an OP: never create circuits to it, * and let it use any circuit ID it wants. */ CIRC_ID_TYPE_NEITHER=2 } circ_id_type_t; #define _CONN_TYPE_MIN 3 /** Type for sockets listening for OR connections. */ #define CONN_TYPE_OR_LISTENER 3 /** A bidirectional TLS connection transmitting a sequence of cells. * May be from an OR to an OR, or from an OP to an OR. */ #define CONN_TYPE_OR 4 /** A TCP connection from an onion router to a stream's destination. */ #define CONN_TYPE_EXIT 5 /** Type for sockets listening for SOCKS connections. */ #define CONN_TYPE_AP_LISTENER 6 /** A SOCKS proxy connection from the user application to the onion * proxy. */ #define CONN_TYPE_AP 7 /** Type for sockets listening for HTTP connections to the directory server. */ #define CONN_TYPE_DIR_LISTENER 8 /** Type for HTTP connections to the directory server. */ #define CONN_TYPE_DIR 9 /** Connection from the main process to a CPU worker process. */ #define CONN_TYPE_CPUWORKER 10 /** Type for listening for connections from user interface process. */ #define CONN_TYPE_CONTROL_LISTENER 11 /** Type for connections from user interface process. */ #define CONN_TYPE_CONTROL 12 /** Type for sockets listening for transparent connections redirected by pf or * netfilter. */ #define CONN_TYPE_AP_TRANS_LISTENER 13 /** Type for sockets listening for transparent connections redirected by * natd. */ #define CONN_TYPE_AP_NATD_LISTENER 14 /** Type for sockets listening for DNS requests. */ #define CONN_TYPE_AP_DNS_LISTENER 15 #define _CONN_TYPE_MAX 15 /* !!!! If _CONN_TYPE_MAX is ever over 15, we must grow the type field in * connection_t. */ /* Proxy client types */ #define PROXY_NONE 0 #define PROXY_CONNECT 1 #define PROXY_SOCKS4 2 #define PROXY_SOCKS5 3 /* !!!! If there is ever a PROXY_* type over 2, we must grow the proxy_type * field in or_connection_t */ /* pluggable transports proxy type */ #define PROXY_PLUGGABLE 4 /* Proxy client handshake states */ /* We use a proxy but we haven't even connected to it yet. */ #define PROXY_INFANT 1 /* We use an HTTP proxy and we've sent the CONNECT command. */ #define PROXY_HTTPS_WANT_CONNECT_OK 2 /* We use a SOCKS4 proxy and we've sent the CONNECT command. */ #define PROXY_SOCKS4_WANT_CONNECT_OK 3 /* We use a SOCKS5 proxy and we try to negotiate without any authentication . */ #define PROXY_SOCKS5_WANT_AUTH_METHOD_NONE 4 /* We use a SOCKS5 proxy and we try to negotiate with Username/Password authentication . */ #define PROXY_SOCKS5_WANT_AUTH_METHOD_RFC1929 5 /* We use a SOCKS5 proxy and we just sent our credentials. */ #define PROXY_SOCKS5_WANT_AUTH_RFC1929_OK 6 /* We use a SOCKS5 proxy and we just sent our CONNECT command. */ #define PROXY_SOCKS5_WANT_CONNECT_OK 7 /* We use a proxy and we CONNECTed successfully!. */ #define PROXY_CONNECTED 8 /** True iff x is an edge connection. */ #define CONN_IS_EDGE(x) \ ((x)->type == CONN_TYPE_EXIT || (x)->type == CONN_TYPE_AP) /** State for any listener connection. */ #define LISTENER_STATE_READY 0 #define _CPUWORKER_STATE_MIN 1 /** State for a connection to a cpuworker process that's idle. */ #define CPUWORKER_STATE_IDLE 1 /** State for a connection to a cpuworker process that's processing a * handshake. */ #define CPUWORKER_STATE_BUSY_ONION 2 #define _CPUWORKER_STATE_MAX 2 #define CPUWORKER_TASK_ONION CPUWORKER_STATE_BUSY_ONION #define _OR_CONN_STATE_MIN 1 /** State for a connection to an OR: waiting for connect() to finish. */ #define OR_CONN_STATE_CONNECTING 1 /** State for a connection to an OR: waiting for proxy handshake to complete */ #define OR_CONN_STATE_PROXY_HANDSHAKING 2 /** State for an OR connection client: SSL is handshaking, not done * yet. */ #define OR_CONN_STATE_TLS_HANDSHAKING 3 /** State for a connection to an OR: We're doing a second SSL handshake for * renegotiation purposes. (V2 handshake only.) */ #define OR_CONN_STATE_TLS_CLIENT_RENEGOTIATING 4 /** State for a connection at an OR: We're waiting for the client to * renegotiate (to indicate a v2 handshake) or send a versions cell (to * indicate a v3 handshake) */ #define OR_CONN_STATE_TLS_SERVER_RENEGOTIATING 5 /** State for an OR connection: We're done with our SSL handshake, we've done * renegotiation, but we haven't yet negotiated link protocol versions and * sent a netinfo cell. */ #define OR_CONN_STATE_OR_HANDSHAKING_V2 6 /** State for an OR connection: We're done with our SSL handshake, but we * haven't yet negotiated link protocol versions, done a V3 handshake, and * sent a netinfo cell. */ #define OR_CONN_STATE_OR_HANDSHAKING_V3 7 /** State for an OR connection: Ready to send/receive cells. */ #define OR_CONN_STATE_OPEN 8 #define _OR_CONN_STATE_MAX 8 #define _EXIT_CONN_STATE_MIN 1 /** State for an exit connection: waiting for response from DNS farm. */ #define EXIT_CONN_STATE_RESOLVING 1 /** State for an exit connection: waiting for connect() to finish. */ #define EXIT_CONN_STATE_CONNECTING 2 /** State for an exit connection: open and ready to transmit data. */ #define EXIT_CONN_STATE_OPEN 3 /** State for an exit connection: waiting to be removed. */ #define EXIT_CONN_STATE_RESOLVEFAILED 4 #define _EXIT_CONN_STATE_MAX 4 /* The AP state values must be disjoint from the EXIT state values. */ #define _AP_CONN_STATE_MIN 5 /** State for a SOCKS connection: waiting for SOCKS request. */ #define AP_CONN_STATE_SOCKS_WAIT 5 /** State for a SOCKS connection: got a y.onion URL; waiting to receive * rendezvous descriptor. */ #define AP_CONN_STATE_RENDDESC_WAIT 6 /** The controller will attach this connection to a circuit; it isn't our * job to do so. */ #define AP_CONN_STATE_CONTROLLER_WAIT 7 /** State for a SOCKS connection: waiting for a completed circuit. */ #define AP_CONN_STATE_CIRCUIT_WAIT 8 /** State for a SOCKS connection: sent BEGIN, waiting for CONNECTED. */ #define AP_CONN_STATE_CONNECT_WAIT 9 /** State for a SOCKS connection: sent RESOLVE, waiting for RESOLVED. */ #define AP_CONN_STATE_RESOLVE_WAIT 10 /** State for a SOCKS connection: ready to send and receive. */ #define AP_CONN_STATE_OPEN 11 /** State for a transparent natd connection: waiting for original * destination. */ #define AP_CONN_STATE_NATD_WAIT 12 #define _AP_CONN_STATE_MAX 12 /** True iff the AP_CONN_STATE_* value s means that the corresponding * edge connection is not attached to any circuit. */ #define AP_CONN_STATE_IS_UNATTACHED(s) \ ((s) <= AP_CONN_STATE_CIRCUIT_WAIT || (s) == AP_CONN_STATE_NATD_WAIT) #define _DIR_CONN_STATE_MIN 1 /** State for connection to directory server: waiting for connect(). */ #define DIR_CONN_STATE_CONNECTING 1 /** State for connection to directory server: sending HTTP request. */ #define DIR_CONN_STATE_CLIENT_SENDING 2 /** State for connection to directory server: reading HTTP response. */ #define DIR_CONN_STATE_CLIENT_READING 3 /** State for connection to directory server: happy and finished. */ #define DIR_CONN_STATE_CLIENT_FINISHED 4 /** State for connection at directory server: waiting for HTTP request. */ #define DIR_CONN_STATE_SERVER_COMMAND_WAIT 5 /** State for connection at directory server: sending HTTP response. */ #define DIR_CONN_STATE_SERVER_WRITING 6 #define _DIR_CONN_STATE_MAX 6 /** True iff the purpose of conn means that it's a server-side * directory connection. */ #define DIR_CONN_IS_SERVER(conn) ((conn)->purpose == DIR_PURPOSE_SERVER) #define _CONTROL_CONN_STATE_MIN 1 /** State for a control connection: Authenticated and accepting v1 commands. */ #define CONTROL_CONN_STATE_OPEN 1 /** State for a control connection: Waiting for authentication; speaking * protocol v1. */ #define CONTROL_CONN_STATE_NEEDAUTH 2 #define _CONTROL_CONN_STATE_MAX 2 #define _DIR_PURPOSE_MIN 3 /** A connection to a directory server: download a rendezvous * descriptor. */ #define DIR_PURPOSE_FETCH_RENDDESC 3 /** A connection to a directory server: set after a rendezvous * descriptor is downloaded. */ #define DIR_PURPOSE_HAS_FETCHED_RENDDESC 4 /** A connection to a directory server: download one or more v2 * network-status objects */ #define DIR_PURPOSE_FETCH_V2_NETWORKSTATUS 5 /** A connection to a directory server: download one or more server * descriptors. */ #define DIR_PURPOSE_FETCH_SERVERDESC 6 /** A connection to a directory server: download one or more extra-info * documents. */ #define DIR_PURPOSE_FETCH_EXTRAINFO 7 /** A connection to a directory server: upload a server descriptor. */ #define DIR_PURPOSE_UPLOAD_DIR 8 /** A connection to a directory server: upload a rendezvous * descriptor. */ #define DIR_PURPOSE_UPLOAD_RENDDESC 9 /** A connection to a directory server: upload a v3 networkstatus vote. */ #define DIR_PURPOSE_UPLOAD_VOTE 10 /** A connection to a directory server: upload a v3 consensus signature */ #define DIR_PURPOSE_UPLOAD_SIGNATURES 11 /** A connection to a directory server: download one or more v3 networkstatus * votes. */ #define DIR_PURPOSE_FETCH_STATUS_VOTE 12 /** A connection to a directory server: download a v3 detached signatures * object for a consensus. */ #define DIR_PURPOSE_FETCH_DETACHED_SIGNATURES 13 /** A connection to a directory server: download a v3 networkstatus * consensus. */ #define DIR_PURPOSE_FETCH_CONSENSUS 14 /** A connection to a directory server: download one or more directory * authority certificates. */ #define DIR_PURPOSE_FETCH_CERTIFICATE 15 /** Purpose for connection at a directory server. */ #define DIR_PURPOSE_SERVER 16 /** A connection to a hidden service directory server: upload a v2 rendezvous * descriptor. */ #define DIR_PURPOSE_UPLOAD_RENDDESC_V2 17 /** A connection to a hidden service directory server: download a v2 rendezvous * descriptor. */ #define DIR_PURPOSE_FETCH_RENDDESC_V2 18 /** A connection to a directory server: download a microdescriptor. */ #define DIR_PURPOSE_FETCH_MICRODESC 19 #define _DIR_PURPOSE_MAX 19 /** True iff p is a purpose corresponding to uploading data to a * directory server. */ #define DIR_PURPOSE_IS_UPLOAD(p) \ ((p)==DIR_PURPOSE_UPLOAD_DIR || \ (p)==DIR_PURPOSE_UPLOAD_RENDDESC || \ (p)==DIR_PURPOSE_UPLOAD_VOTE || \ (p)==DIR_PURPOSE_UPLOAD_SIGNATURES) #define _EXIT_PURPOSE_MIN 1 /** This exit stream wants to do an ordinary connect. */ #define EXIT_PURPOSE_CONNECT 1 /** This exit stream wants to do a resolve (either normal or reverse). */ #define EXIT_PURPOSE_RESOLVE 2 #define _EXIT_PURPOSE_MAX 2 /* !!!! If any connection purpose is ever over 31, we must grow the type * field in connection_t. */ /** Circuit state: I'm the origin, still haven't done all my handshakes. */ #define CIRCUIT_STATE_BUILDING 0 /** Circuit state: Waiting to process the onionskin. */ #define CIRCUIT_STATE_ONIONSKIN_PENDING 1 /** Circuit state: I'd like to deliver a create, but my n_conn is still * connecting. */ #define CIRCUIT_STATE_OR_WAIT 2 /** Circuit state: onionskin(s) processed, ready to send/receive cells. */ #define CIRCUIT_STATE_OPEN 3 #define _CIRCUIT_PURPOSE_MIN 1 /* these circuits were initiated elsewhere */ #define _CIRCUIT_PURPOSE_OR_MIN 1 /** OR-side circuit purpose: normal circuit, at OR. */ #define CIRCUIT_PURPOSE_OR 1 /** OR-side circuit purpose: At OR, from Bob, waiting for intro from Alices. */ #define CIRCUIT_PURPOSE_INTRO_POINT 2 /** OR-side circuit purpose: At OR, from Alice, waiting for Bob. */ #define CIRCUIT_PURPOSE_REND_POINT_WAITING 3 /** OR-side circuit purpose: At OR, both circuits have this purpose. */ #define CIRCUIT_PURPOSE_REND_ESTABLISHED 4 #define _CIRCUIT_PURPOSE_OR_MAX 4 /* these circuits originate at this node */ /* here's how circ client-side purposes work: * normal circuits are C_GENERAL. * circuits that are c_introducing are either on their way to * becoming open, or they are open and waiting for a * suitable rendcirc before they send the intro. * circuits that are c_introduce_ack_wait have sent the intro, * but haven't gotten a response yet. * circuits that are c_establish_rend are either on their way * to becoming open, or they are open and have sent the * establish_rendezvous cell but haven't received an ack. * circuits that are c_rend_ready are open and have received a * rend ack, but haven't heard from bob yet. if they have a * buildstate->pending_final_cpath then they're expecting a * cell from bob, else they're not. * circuits that are c_rend_ready_intro_acked are open, and * some intro circ has sent its intro and received an ack. * circuits that are c_rend_joined are open, have heard from * bob, and are talking to him. */ /** Client-side circuit purpose: Normal circuit, with cpath. */ #define CIRCUIT_PURPOSE_C_GENERAL 5 /** Client-side circuit purpose: at Alice, connecting to intro point. */ #define CIRCUIT_PURPOSE_C_INTRODUCING 6 /** Client-side circuit purpose: at Alice, sent INTRODUCE1 to intro point, * waiting for ACK/NAK. */ #define CIRCUIT_PURPOSE_C_INTRODUCE_ACK_WAIT 7 /** Client-side circuit purpose: at Alice, introduced and acked, closing. */ #define CIRCUIT_PURPOSE_C_INTRODUCE_ACKED 8 /** Client-side circuit purpose: at Alice, waiting for ack. */ #define CIRCUIT_PURPOSE_C_ESTABLISH_REND 9 /** Client-side circuit purpose: at Alice, waiting for Bob. */ #define CIRCUIT_PURPOSE_C_REND_READY 10 /** Client-side circuit purpose: at Alice, waiting for Bob, INTRODUCE * has been acknowledged. */ #define CIRCUIT_PURPOSE_C_REND_READY_INTRO_ACKED 11 /** Client-side circuit purpose: at Alice, rendezvous established. */ #define CIRCUIT_PURPOSE_C_REND_JOINED 12 /** This circuit is used for build time measurement only */ #define CIRCUIT_PURPOSE_C_MEASURE_TIMEOUT 13 #define _CIRCUIT_PURPOSE_C_MAX 13 /** Hidden-service-side circuit purpose: at Bob, waiting for introductions. */ #define CIRCUIT_PURPOSE_S_ESTABLISH_INTRO 14 /** Hidden-service-side circuit purpose: at Bob, successfully established * intro. */ #define CIRCUIT_PURPOSE_S_INTRO 15 /** Hidden-service-side circuit purpose: at Bob, connecting to rend point. */ #define CIRCUIT_PURPOSE_S_CONNECT_REND 16 /** Hidden-service-side circuit purpose: at Bob, rendezvous established. */ #define CIRCUIT_PURPOSE_S_REND_JOINED 17 /** A testing circuit; not meant to be used for actual traffic. */ #define CIRCUIT_PURPOSE_TESTING 18 /** A controller made this circuit and Tor should not use it. */ #define CIRCUIT_PURPOSE_CONTROLLER 19 #define _CIRCUIT_PURPOSE_MAX 19 /** A catch-all for unrecognized purposes. Currently we don't expect * to make or see any circuits with this purpose. */ #define CIRCUIT_PURPOSE_UNKNOWN 255 /** True iff the circuit purpose p is for a circuit that * originated at this node. */ #define CIRCUIT_PURPOSE_IS_ORIGIN(p) ((p)>_CIRCUIT_PURPOSE_OR_MAX) /** True iff the circuit purpose p is for a circuit that originated * here to serve as a client. (Hidden services don't count here.) */ #define CIRCUIT_PURPOSE_IS_CLIENT(p) \ ((p)> _CIRCUIT_PURPOSE_OR_MAX && \ (p)<=_CIRCUIT_PURPOSE_C_MAX) /** True iff the circuit_t c is actually an origin_circuit_t. */ #define CIRCUIT_IS_ORIGIN(c) (CIRCUIT_PURPOSE_IS_ORIGIN((c)->purpose)) /** True iff the circuit purpose p is for an established rendezvous * circuit. */ #define CIRCUIT_PURPOSE_IS_ESTABLISHED_REND(p) \ ((p) == CIRCUIT_PURPOSE_C_REND_JOINED || \ (p) == CIRCUIT_PURPOSE_S_REND_JOINED) /** How many circuits do we want simultaneously in-progress to handle * a given stream? */ #define MIN_CIRCUITS_HANDLING_STREAM 2 /* These RELAY_COMMAND constants define values for relay cell commands, and * must match those defined in tor-spec.txt. */ #define RELAY_COMMAND_BEGIN 1 #define RELAY_COMMAND_DATA 2 #define RELAY_COMMAND_END 3 #define RELAY_COMMAND_CONNECTED 4 #define RELAY_COMMAND_SENDME 5 #define RELAY_COMMAND_EXTEND 6 #define RELAY_COMMAND_EXTENDED 7 #define RELAY_COMMAND_TRUNCATE 8 #define RELAY_COMMAND_TRUNCATED 9 #define RELAY_COMMAND_DROP 10 #define RELAY_COMMAND_RESOLVE 11 #define RELAY_COMMAND_RESOLVED 12 #define RELAY_COMMAND_BEGIN_DIR 13 #define RELAY_COMMAND_ESTABLISH_INTRO 32 #define RELAY_COMMAND_ESTABLISH_RENDEZVOUS 33 #define RELAY_COMMAND_INTRODUCE1 34 #define RELAY_COMMAND_INTRODUCE2 35 #define RELAY_COMMAND_RENDEZVOUS1 36 #define RELAY_COMMAND_RENDEZVOUS2 37 #define RELAY_COMMAND_INTRO_ESTABLISHED 38 #define RELAY_COMMAND_RENDEZVOUS_ESTABLISHED 39 #define RELAY_COMMAND_INTRODUCE_ACK 40 /* Reasons why an OR connection is closed. */ #define END_OR_CONN_REASON_DONE 1 #define END_OR_CONN_REASON_REFUSED 2 /* connection refused */ #define END_OR_CONN_REASON_OR_IDENTITY 3 #define END_OR_CONN_REASON_CONNRESET 4 /* connection reset by peer */ #define END_OR_CONN_REASON_TIMEOUT 5 #define END_OR_CONN_REASON_NO_ROUTE 6 /* no route to host/net */ #define END_OR_CONN_REASON_IO_ERROR 7 /* read/write error */ #define END_OR_CONN_REASON_RESOURCE_LIMIT 8 /* sockets, buffers, etc */ #define END_OR_CONN_REASON_MISC 9 /* Reasons why we (or a remote OR) might close a stream. See tor-spec.txt for * documentation of these. The values must match. */ #define END_STREAM_REASON_MISC 1 #define END_STREAM_REASON_RESOLVEFAILED 2 #define END_STREAM_REASON_CONNECTREFUSED 3 #define END_STREAM_REASON_EXITPOLICY 4 #define END_STREAM_REASON_DESTROY 5 #define END_STREAM_REASON_DONE 6 #define END_STREAM_REASON_TIMEOUT 7 #define END_STREAM_REASON_NOROUTE 8 #define END_STREAM_REASON_HIBERNATING 9 #define END_STREAM_REASON_INTERNAL 10 #define END_STREAM_REASON_RESOURCELIMIT 11 #define END_STREAM_REASON_CONNRESET 12 #define END_STREAM_REASON_TORPROTOCOL 13 #define END_STREAM_REASON_NOTDIRECTORY 14 #define END_STREAM_REASON_ENTRYPOLICY 15 /* These high-numbered end reasons are not part of the official spec, * and are not intended to be put in relay end cells. They are here * to be more informative when sending back socks replies to the * application. */ /* XXXX 256 is no longer used; feel free to reuse it. */ /** We were unable to attach the connection to any circuit at all. */ /* XXXX the ways we use this one don't make a lot of sense. */ #define END_STREAM_REASON_CANT_ATTACH 257 /** We can't connect to any directories at all, so we killed our streams * before they can time out. */ #define END_STREAM_REASON_NET_UNREACHABLE 258 /** This is a SOCKS connection, and the client used (or misused) the SOCKS * protocol in a way we couldn't handle. */ #define END_STREAM_REASON_SOCKSPROTOCOL 259 /** This is a transparent proxy connection, but we can't extract the original * target address:port. */ #define END_STREAM_REASON_CANT_FETCH_ORIG_DEST 260 /** This is a connection on the NATD port, and the destination IP:Port was * either ill-formed or out-of-range. */ #define END_STREAM_REASON_INVALID_NATD_DEST 261 /** The target address is in a private network (like 127.0.0.1 or 10.0.0.1); * you don't want to do that over a randomly chosen exit */ #define END_STREAM_REASON_PRIVATE_ADDR 262 /** Bitwise-and this value with endreason to mask out all flags. */ #define END_STREAM_REASON_MASK 511 /** Bitwise-or this with the argument to control_event_stream_status * to indicate that the reason came from an END cell. */ #define END_STREAM_REASON_FLAG_REMOTE 512 /** Bitwise-or this with the argument to control_event_stream_status * to indicate that we already sent a CLOSED stream event. */ #define END_STREAM_REASON_FLAG_ALREADY_SENT_CLOSED 1024 /** Bitwise-or this with endreason to indicate that we already sent * a socks reply, and no further reply needs to be sent from * connection_mark_unattached_ap(). */ #define END_STREAM_REASON_FLAG_ALREADY_SOCKS_REPLIED 2048 /** Reason for remapping an AP connection's address: we have a cached * answer. */ #define REMAP_STREAM_SOURCE_CACHE 1 /** Reason for remapping an AP connection's address: the exit node told us an * answer. */ #define REMAP_STREAM_SOURCE_EXIT 2 /* 'type' values to use in RESOLVED cells. Specified in tor-spec.txt. */ #define RESOLVED_TYPE_HOSTNAME 0 #define RESOLVED_TYPE_IPV4 4 #define RESOLVED_TYPE_IPV6 6 #define RESOLVED_TYPE_ERROR_TRANSIENT 0xF0 #define RESOLVED_TYPE_ERROR 0xF1 /* Negative reasons are internal: we never send them in a DESTROY or TRUNCATE * call; they only go to the controller for tracking */ /** Our post-timeout circuit time measurement period expired. * We must give up now */ #define END_CIRC_REASON_MEASUREMENT_EXPIRED -3 /** We couldn't build a path for this circuit. */ #define END_CIRC_REASON_NOPATH -2 /** Catch-all "other" reason for closing origin circuits. */ #define END_CIRC_AT_ORIGIN -1 /* Reasons why we (or a remote OR) might close a circuit. See tor-spec.txt for * documentation of these. */ #define _END_CIRC_REASON_MIN 0 #define END_CIRC_REASON_NONE 0 #define END_CIRC_REASON_TORPROTOCOL 1 #define END_CIRC_REASON_INTERNAL 2 #define END_CIRC_REASON_REQUESTED 3 #define END_CIRC_REASON_HIBERNATING 4 #define END_CIRC_REASON_RESOURCELIMIT 5 #define END_CIRC_REASON_CONNECTFAILED 6 #define END_CIRC_REASON_OR_IDENTITY 7 #define END_CIRC_REASON_OR_CONN_CLOSED 8 #define END_CIRC_REASON_FINISHED 9 #define END_CIRC_REASON_TIMEOUT 10 #define END_CIRC_REASON_DESTROYED 11 #define END_CIRC_REASON_NOSUCHSERVICE 12 #define _END_CIRC_REASON_MAX 12 /** Bitwise-OR this with the argument to circuit_mark_for_close() or * control_event_circuit_status() to indicate that the reason was * passed through from a destroy or truncate cell. */ #define END_CIRC_REASON_FLAG_REMOTE 512 /** Length of 'y' portion of 'y.onion' URL. */ #define REND_SERVICE_ID_LEN_BASE32 16 /** Length of 'y.onion' including '.onion' URL. */ #define REND_SERVICE_ADDRESS_LEN (16+1+5) /** Length of a binary-encoded rendezvous service ID. */ #define REND_SERVICE_ID_LEN 10 /** Time period for which a v2 descriptor will be valid. */ #define REND_TIME_PERIOD_V2_DESC_VALIDITY (24*60*60) /** Time period within which two sets of v2 descriptors will be uploaded in * parallel. */ #define REND_TIME_PERIOD_OVERLAPPING_V2_DESCS (60*60) /** Number of non-consecutive replicas (i.e. distributed somewhere * in the ring) for a descriptor. */ #define REND_NUMBER_OF_NON_CONSECUTIVE_REPLICAS 2 /** Number of consecutive replicas for a descriptor. */ #define REND_NUMBER_OF_CONSECUTIVE_REPLICAS 3 /** Length of v2 descriptor ID (32 base32 chars = 160 bits). */ #define REND_DESC_ID_V2_LEN_BASE32 32 /** Length of the base32-encoded secret ID part of versioned hidden service * descriptors. */ #define REND_SECRET_ID_PART_LEN_BASE32 32 /** Length of the base32-encoded hash of an introduction point's * identity key. */ #define REND_INTRO_POINT_ID_LEN_BASE32 32 /** Length of the descriptor cookie that is used for client authorization * to hidden services. */ #define REND_DESC_COOKIE_LEN 16 /** Length of the base64-encoded descriptor cookie that is used for * exchanging client authorization between hidden service and client. */ #define REND_DESC_COOKIE_LEN_BASE64 22 /** Length of client identifier in encrypted introduction points for hidden * service authorization type 'basic'. */ #define REND_BASIC_AUTH_CLIENT_ID_LEN 4 /** Multiple of the number of clients to which the real number of clients * is padded with fake clients for hidden service authorization type * 'basic'. */ #define REND_BASIC_AUTH_CLIENT_MULTIPLE 16 /** Length of client entry consisting of client identifier and encrypted * session key for hidden service authorization type 'basic'. */ #define REND_BASIC_AUTH_CLIENT_ENTRY_LEN (REND_BASIC_AUTH_CLIENT_ID_LEN \ + CIPHER_KEY_LEN) /** Maximum size of v2 hidden service descriptors. */ #define REND_DESC_MAX_SIZE (20 * 1024) /** Legal characters for use in authorized client names for a hidden * service. */ #define REND_LEGAL_CLIENTNAME_CHARACTERS \ "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789+-_" /** Maximum length of authorized client names for a hidden service. */ #define REND_CLIENTNAME_MAX_LEN 16 /** Length of the rendezvous cookie that is used to connect circuits at the * rendezvous point. */ #define REND_COOKIE_LEN DIGEST_LEN /** Client authorization type that a hidden service performs. */ typedef enum rend_auth_type_t { REND_NO_AUTH = 0, REND_BASIC_AUTH = 1, REND_STEALTH_AUTH = 2, } rend_auth_type_t; /** Client-side configuration of authorization for a hidden service. */ typedef struct rend_service_authorization_t { char descriptor_cookie[REND_DESC_COOKIE_LEN]; char onion_address[REND_SERVICE_ADDRESS_LEN+1]; rend_auth_type_t auth_type; } rend_service_authorization_t; /** Client- and server-side data that is used for hidden service connection * establishment. Not all fields contain data depending on where this struct * is used. */ typedef struct rend_data_t { /** Onion address (without the .onion part) that a client requests. */ char onion_address[REND_SERVICE_ID_LEN_BASE32+1]; /** (Optional) descriptor cookie that is used by a client. */ char descriptor_cookie[REND_DESC_COOKIE_LEN]; /** Authorization type for accessing a service used by a client. */ rend_auth_type_t auth_type; /** Hash of the hidden service's PK used by a service. */ char rend_pk_digest[DIGEST_LEN]; /** Rendezvous cookie used by both, client and service. */ char rend_cookie[REND_COOKIE_LEN]; } rend_data_t; /** Time interval for tracking replays of DH public keys received in * INTRODUCE2 cells. Used only to avoid launching multiple * simultaneous attempts to connect to the same rendezvous point. */ #define REND_REPLAY_TIME_INTERVAL (5 * 60) /** Used to indicate which way a cell is going on a circuit. */ typedef enum { CELL_DIRECTION_IN=1, /**< The cell is moving towards the origin. */ CELL_DIRECTION_OUT=2, /**< The cell is moving away from the origin. */ } cell_direction_t; /** Initial value for both sides of a circuit transmission window when the * circuit is initialized. Measured in cells. */ #define CIRCWINDOW_START 1000 #define CIRCWINDOW_START_MIN 100 #define CIRCWINDOW_START_MAX 1000 /** Amount to increment a circuit window when we get a circuit SENDME. */ #define CIRCWINDOW_INCREMENT 100 /** Initial value on both sides of a stream transmission window when the * stream is initialized. Measured in cells. */ #define STREAMWINDOW_START 500 /** Amount to increment a stream window when we get a stream SENDME. */ #define STREAMWINDOW_INCREMENT 50 /* Cell commands. These values are defined in tor-spec.txt. */ #define CELL_PADDING 0 #define CELL_CREATE 1 #define CELL_CREATED 2 #define CELL_RELAY 3 #define CELL_DESTROY 4 #define CELL_CREATE_FAST 5 #define CELL_CREATED_FAST 6 #define CELL_VERSIONS 7 #define CELL_NETINFO 8 #define CELL_RELAY_EARLY 9 #define CELL_VPADDING 128 #define CELL_CERTS 129 #define CELL_AUTH_CHALLENGE 130 #define CELL_AUTHENTICATE 131 #define CELL_AUTHORIZE 132 /** How long to test reachability before complaining to the user. */ #define TIMEOUT_UNTIL_UNREACHABILITY_COMPLAINT (20*60) /** Legal characters in a nickname. */ #define LEGAL_NICKNAME_CHARACTERS \ "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789" /** Name to use in client TLS certificates if no nickname is given. Once * Tor 0.1.2.x is obsolete, we can remove this. */ #define DEFAULT_CLIENT_NICKNAME "client" /** Name chosen by routers that don't configure nicknames */ #define UNNAMED_ROUTER_NICKNAME "Unnamed" /** Number of bytes in a SOCKS4 header. */ #define SOCKS4_NETWORK_LEN 8 /* * Relay payload: * Relay command [1 byte] * Recognized [2 bytes] * Stream ID [2 bytes] * Partial SHA-1 [4 bytes] * Length [2 bytes] * Relay payload [498 bytes] */ /** Number of bytes in a cell, minus cell header. */ #define CELL_PAYLOAD_SIZE 509 /** Number of bytes in a cell transmitted over the network. */ #define CELL_NETWORK_SIZE 512 /** Length of a header on a variable-length cell. */ #define VAR_CELL_HEADER_SIZE 5 /** Number of bytes in a relay cell's header (not including general cell * header). */ #define RELAY_HEADER_SIZE (1+2+2+4+2) /** Largest number of bytes that can fit in a relay cell payload. */ #define RELAY_PAYLOAD_SIZE (CELL_PAYLOAD_SIZE-RELAY_HEADER_SIZE) /** Identifies a circuit on an or_connection */ typedef uint16_t circid_t; /** Identifies a stream on a circuit */ typedef uint16_t streamid_t; /** Parsed onion routing cell. All communication between nodes * is via cells. */ typedef struct cell_t { circid_t circ_id; /**< Circuit which received the cell. */ uint8_t command; /**< Type of the cell: one of CELL_PADDING, CELL_CREATE, * CELL_DESTROY, etc */ uint8_t payload[CELL_PAYLOAD_SIZE]; /**< Cell body. */ } cell_t; /** Parsed variable-length onion routing cell. */ typedef struct var_cell_t { /** Type of the cell: CELL_VERSIONS, etc. */ uint8_t command; /** Circuit thich received the cell */ circid_t circ_id; /** Number of bytes actually stored in payload */ uint16_t payload_len; /** Payload of this cell */ uint8_t payload[FLEXIBLE_ARRAY_MEMBER]; } var_cell_t; /** A cell as packed for writing to the network. */ typedef struct packed_cell_t { struct packed_cell_t *next; /**< Next cell queued on this circuit. */ char body[CELL_NETWORK_SIZE]; /**< Cell as packed for network. */ } packed_cell_t; /** Number of cells added to a circuit queue including their insertion * time on 10 millisecond detail; used for buffer statistics. */ typedef struct insertion_time_elem_t { struct insertion_time_elem_t *next; /**< Next element in queue. */ uint32_t insertion_time; /**< When were cells inserted (in 10 ms steps * starting at 0:00 of the current day)? */ unsigned counter; /**< How many cells were inserted? */ } insertion_time_elem_t; /** Queue of insertion times. */ typedef struct insertion_time_queue_t { struct insertion_time_elem_t *first; /**< First element in queue. */ struct insertion_time_elem_t *last; /**< Last element in queue. */ } insertion_time_queue_t; /** A queue of cells on a circuit, waiting to be added to the * or_connection_t's outbuf. */ typedef struct cell_queue_t { packed_cell_t *head; /**< The first cell, or NULL if the queue is empty. */ packed_cell_t *tail; /**< The last cell, or NULL if the queue is empty. */ int n; /**< The number of cells in the queue. */ insertion_time_queue_t *insertion_times; /**< Insertion times of cells. */ } cell_queue_t; /** Beginning of a RELAY cell payload. */ typedef struct { uint8_t command; /**< The end-to-end relay command. */ uint16_t recognized; /**< Used to tell whether cell is for us. */ streamid_t stream_id; /**< Which stream is this cell associated with? */ char integrity[4]; /**< Used to tell whether cell is corrupted. */ uint16_t length; /**< How long is the payload body? */ } relay_header_t; typedef struct buf_t buf_t; typedef struct socks_request_t socks_request_t; #ifdef USE_BUFFEREVENTS #define generic_buffer_t struct evbuffer #else #define generic_buffer_t buf_t #endif /* Values for connection_t.magic: used to make sure that downcasts (casts from * connection_t to foo_connection_t) are safe. */ #define BASE_CONNECTION_MAGIC 0x7C3C304Eu #define OR_CONNECTION_MAGIC 0x7D31FF03u #define EDGE_CONNECTION_MAGIC 0xF0374013u #define ENTRY_CONNECTION_MAGIC 0xbb4a5703 #define DIR_CONNECTION_MAGIC 0x9988ffeeu #define CONTROL_CONNECTION_MAGIC 0x8abc765du #define LISTENER_CONNECTION_MAGIC 0x1a1ac741u /** Description of a connection to another host or process, and associated * data. * * A connection is named based on what it's connected to -- an "OR * connection" has a Tor node on the other end, an "exit * connection" has a website or other server on the other end, and an * "AP connection" has an application proxy (and thus a user) on the * other end. * * Every connection has a type and a state. Connections never change * their type, but can go through many state changes in their lifetime. * * Every connection has two associated input and output buffers. * Listeners don't use them. For non-listener connections, incoming * data is appended to conn->inbuf, and outgoing data is taken from * conn->outbuf. Connections differ primarily in the functions called * to fill and drain these buffers. */ typedef struct connection_t { uint32_t magic; /**< For memory debugging: must equal one of * *_CONNECTION_MAGIC. */ uint8_t state; /**< Current state of this connection. */ unsigned int type:4; /**< What kind of connection is this? */ unsigned int purpose:5; /**< Only used for DIR and EXIT types currently. */ /* The next fields are all one-bit booleans. Some are only applicable to * connection subtypes, but we hold them here anyway, to save space. */ unsigned int read_blocked_on_bw:1; /**< Boolean: should we start reading * again once the bandwidth throttler allows it? */ unsigned int write_blocked_on_bw:1; /**< Boolean: should we start writing * again once the bandwidth throttler allows * writes? */ unsigned int hold_open_until_flushed:1; /**< Despite this connection's being * marked for close, do we flush it * before closing it? */ unsigned int inbuf_reached_eof:1; /**< Boolean: did read() return 0 on this * conn? */ /** Set to 1 when we're inside connection_flushed_some to keep us from * calling connection_handle_write() recursively. */ unsigned int in_flushed_some:1; /* For linked connections: */ unsigned int linked:1; /**< True if there is, or has been, a linked_conn. */ /** True iff we'd like to be notified about read events from the * linked conn. */ unsigned int reading_from_linked_conn:1; /** True iff we're willing to write to the linked conn. */ unsigned int writing_to_linked_conn:1; /** True iff we're currently able to read on the linked conn, and our * read_event should be made active with libevent. */ unsigned int active_on_link:1; /** True iff we've called connection_close_immediate() on this linked * connection. */ unsigned int linked_conn_is_closed:1; /** CONNECT/SOCKS proxy client handshake state (for outgoing connections). */ unsigned int proxy_state:4; /** Our socket; set to TOR_INVALID_SOCKET if this connection is closed, * or has no socket. */ tor_socket_t s; int conn_array_index; /**< Index into the global connection array. */ struct event *read_event; /**< Libevent event structure. */ struct event *write_event; /**< Libevent event structure. */ buf_t *inbuf; /**< Buffer holding data read over this connection. */ buf_t *outbuf; /**< Buffer holding data to write over this connection. */ size_t outbuf_flushlen; /**< How much data should we try to flush from the * outbuf? */ time_t timestamp_lastread; /**< When was the last time libevent said we could * read? */ time_t timestamp_lastwritten; /**< When was the last time libevent said we * could write? */ #ifdef USE_BUFFEREVENTS struct bufferevent *bufev; /**< A Libevent buffered IO structure. */ #endif time_t timestamp_created; /**< When was this connection_t created? */ /* XXXX_IP6 make this IPv6-capable */ int socket_family; /**< Address family of this connection's socket. Usually * AF_INET, but it can also be AF_UNIX, or in the future * AF_INET6 */ tor_addr_t addr; /**< IP of the other side of the connection; used to * identify routers, along with port. */ uint16_t port; /**< If non-zero, port on the other end * of the connection. */ uint16_t marked_for_close; /**< Should we close this conn on the next * iteration of the main loop? (If true, holds * the line number where this connection was * marked.) */ const char *marked_for_close_file; /**< For debugging: in which file were * we marked for close? */ char *address; /**< FQDN (or IP) of the guy on the other end. * strdup into this, because free_connection() frees it. */ /** Another connection that's connected to this one in lieu of a socket. */ struct connection_t *linked_conn; /** Unique identifier for this connection on this Tor instance. */ uint64_t global_identifier; /** Unique ID for measuring tunneled network status requests. */ uint64_t dirreq_id; } connection_t; /* DOCDOC listener_connection_t */ typedef struct listener_connection_t { connection_t _base; /** If the connection is a CONN_TYPE_AP_DNS_LISTENER, this field points * to the evdns_server_port it uses to listen to and answer connections. */ struct evdns_server_port *dns_server_port; /** @name Isolation parameters * * For an AP listener, these fields describe how to isolate streams that * arrive on the listener. * * @{ */ /** The session group for this listener. */ int session_group; /** One or more ISO_ flags to describe how to isolate streams. */ uint8_t isolation_flags; /**@}*/ } listener_connection_t; /** Minimum length of the random part of an AUTH_CHALLENGE cell. */ #define OR_AUTH_CHALLENGE_LEN 32 /** * @name Certificate types for CERTS cells. * * These values are defined by the protocol, and affect how an X509 * certificate in a CERTS cell is interpreted and used. * * @{ */ /** A certificate that authenticates a TLS link key. The subject key * must match the key used in the TLS handshake; it must be signed by * the identity key. */ #define OR_CERT_TYPE_TLS_LINK 1 /** A self-signed identity certificate. The subject key must be a * 1024-bit RSA key. */ #define OR_CERT_TYPE_ID_1024 2 /** A certificate that authenticates a key used in an AUTHENTICATE cell * in the v3 handshake. The subject key must be a 1024-bit RSA key; it * must be signed by the identity key */ #define OR_CERT_TYPE_AUTH_1024 3 /**@}*/ /** The one currently supported type of AUTHENTICATE cell. It contains * a bunch of structures signed with an RSA1024 key. The signed * structures include a HMAC using negotiated TLS secrets, and a digest * of all cells sent or received before the AUTHENTICATE cell (including * the random server-generated AUTH_CHALLENGE cell). */ #define AUTHTYPE_RSA_SHA256_TLSSECRET 1 /** The length of the part of the AUTHENTICATE cell body that the client and * server can generate independently (when using RSA_SHA256_TLSSECRET). It * contains everything except the client's timestamp, the client's randomly * generated nonce, and the signature. */ #define V3_AUTH_FIXED_PART_LEN (8+(32*6)) /** The length of the part of the AUTHENTICATE cell body that the client * signs. */ #define V3_AUTH_BODY_LEN (V3_AUTH_FIXED_PART_LEN + 8 + 16) /** Stores flags and information related to the portion of a v2/v3 Tor OR * connection handshake that happens after the TLS handshake is finished. */ typedef struct or_handshake_state_t { /** When was the VERSIONS cell sent on this connection? Used to get * an estimate of the skew in the returning NETINFO reply. */ time_t sent_versions_at; /** True iff we originated this connection */ unsigned int started_here : 1; /** True iff we have received and processed a VERSIONS cell. */ unsigned int received_versions : 1; /** True iff we have received and processed an AUTH_CHALLENGE cell */ unsigned int received_auth_challenge : 1; /** True iff we have received and processed a CERTS cell. */ unsigned int received_certs_cell : 1; /** True iff we have received and processed an AUTHENTICATE cell */ unsigned int received_authenticate : 1; /* True iff we've received valid authentication to some identity. */ unsigned int authenticated : 1; /** True iff we should feed outgoing cells into digest_sent and * digest_received respectively. * * From the server's side of the v3 handshake, we want to capture everything * from the VERSIONS cell through and including the AUTH_CHALLENGE cell. * From the client's, we want to capture everything from the VERSIONS cell * through but *not* including the AUTHENTICATE cell. * * @{ */ unsigned int digest_sent_data : 1; unsigned int digest_received_data : 1; /**@}*/ /** Identity digest that we have received and authenticated for our peer * on this connection. */ uint8_t authenticated_peer_id[DIGEST_LEN]; /** Digests of the cells that we have sent or received as part of a V3 * handshake. Used for making and checking AUTHENTICATE cells. * * @{ */ crypto_digest_t *digest_sent; crypto_digest_t *digest_received; /** @} */ /** Certificates that a connection initiator sent us in a CERTS cell; we're * holding on to them until we get an AUTHENTICATE cell. * * @{ */ /** The cert for the key that's supposed to sign the AUTHENTICATE cell */ tor_cert_t *auth_cert; /** A self-signed identity certificate */ tor_cert_t *id_cert; /**@}*/ } or_handshake_state_t; /** Subtype of connection_t for an "OR connection" -- that is, one that speaks * cells over TLS. */ typedef struct or_connection_t { connection_t _base; /** Hash of the public RSA key for the other side's identity key, or zeroes * if the other side hasn't shown us a valid identity key. */ char identity_digest[DIGEST_LEN]; char *nickname; /**< Nickname of OR on other side (if any). */ tor_tls_t *tls; /**< TLS connection state. */ int tls_error; /**< Last tor_tls error code. */ /** When we last used this conn for any client traffic. If not * recent, we can rate limit it further. */ time_t client_used; tor_addr_t real_addr; /**< The actual address that this connection came from * or went to. The addr field is prone to * getting overridden by the address from the router * descriptor matching identity_digest. */ circ_id_type_t circ_id_type:2; /**< When we send CREATE cells along this * connection, which half of the space should * we use? */ /** Should this connection be used for extending circuits to the server * matching the identity_digest field? Set to true if we're pretty * sure we aren't getting MITMed, either because we're connected to an * address listed in a server descriptor, or because an authenticated * NETINFO cell listed the address we're connected to as recognized. */ unsigned int is_canonical:1; /** True iff this connection shouldn't get any new circs attached to it, * because the connection is too old, or because there's a better one. * More generally, this flag is used to note an unhealthy connection; * for example, if a bad connection fails we shouldn't assume that the * router itself has a problem. */ unsigned int is_bad_for_new_circs:1; /** True iff we have decided that the other end of this connection * is a client. Connections with this flag set should never be used * to satisfy an EXTEND request. */ unsigned int is_connection_with_client:1; /** True iff this is an outgoing connection. */ unsigned int is_outgoing:1; unsigned int proxy_type:2; /**< One of PROXY_NONE...PROXY_SOCKS5 */ uint8_t link_proto; /**< What protocol version are we using? 0 for * "none negotiated yet." */ circid_t next_circ_id; /**< Which circ_id do we try to use next on * this connection? This is always in the * range 0..1<<15-1. */ or_handshake_state_t *handshake_state; /**< If we are setting this connection * up, state information to do so. */ time_t timestamp_lastempty; /**< When was the outbuf last completely empty?*/ time_t timestamp_last_added_nonpadding; /** When did we last add a * non-padding cell to the outbuf? */ /* bandwidth* and *_bucket only used by ORs in OPEN state: */ int bandwidthrate; /**< Bytes/s added to the bucket. (OPEN ORs only.) */ int bandwidthburst; /**< Max bucket size for this conn. (OPEN ORs only.) */ #ifndef USE_BUFFEREVENTS int read_bucket; /**< When this hits 0, stop receiving. Every second we * add 'bandwidthrate' to this, capping it at * bandwidthburst. (OPEN ORs only) */ int write_bucket; /**< When this hits 0, stop writing. Like read_bucket. */ #else /** A rate-limiting configuration object to determine how this connection * set its read- and write- limits. */ /* XXXX we could share this among all connections. */ struct ev_token_bucket_cfg *bucket_cfg; #endif int n_circuits; /**< How many circuits use this connection as p_conn or * n_conn ? */ /** Double-linked ring of circuits with queued cells waiting for room to * free up on this connection's outbuf. Every time we pull cells from a * circuit, we advance this pointer to the next circuit in the ring. */ struct circuit_t *active_circuits; /** Priority queue of cell_ewma_t for circuits with queued cells waiting for * room to free up on this connection's outbuf. Kept in heap order * according to EWMA. * * This is redundant with active_circuits; if we ever decide only to use the * cell_ewma algorithm for choosing circuits, we can remove active_circuits. */ smartlist_t *active_circuit_pqueue; /** The tick on which the cell_ewma_ts in active_circuit_pqueue last had * their ewma values rescaled. */ unsigned active_circuit_pqueue_last_recalibrated; struct or_connection_t *next_with_same_id; /**< Next connection with same * identity digest as this one. */ } or_connection_t; /** Subtype of connection_t for an "edge connection" -- that is, an entry (ap) * connection, or an exit. */ typedef struct edge_connection_t { connection_t _base; struct edge_connection_t *next_stream; /**< Points to the next stream at this * edge, if any */ int package_window; /**< How many more relay cells can I send into the * circuit? */ int deliver_window; /**< How many more relay cells can end at me? */ struct circuit_t *on_circuit; /**< The circuit (if any) that this edge * connection is using. */ /** A pointer to which node in the circ this conn exits at. Set for AP * connections and for hidden service exit connections. */ struct crypt_path_t *cpath_layer; /** What rendezvous service are we querying for (if an AP) or providing (if * an exit)? */ rend_data_t *rend_data; uint32_t address_ttl; /**< TTL for address-to-addr mapping on exit * connection. Exit connections only. */ streamid_t stream_id; /**< The stream ID used for this edge connection on its * circuit */ /** The reason why this connection is closing; passed to the controller. */ uint16_t end_reason; /** Bytes read since last call to control_event_stream_bandwidth_used() */ uint32_t n_read; /** Bytes written since last call to control_event_stream_bandwidth_used() */ uint32_t n_written; /** True iff this connection is for a DNS request only. */ unsigned int is_dns_request:1; unsigned int edge_has_sent_end:1; /**< For debugging; only used on edge * connections. Set once we've set the stream end, * and check in connection_about_to_close_connection(). */ /** True iff we've blocked reading until the circuit has fewer queued * cells. */ unsigned int edge_blocked_on_circ:1; } edge_connection_t; /** Subtype of edge_connection_t for an "entry connection" -- that is, a SOCKS * connection, a DNS request, a TransPort connection or a NATD connection */ typedef struct entry_connection_t { edge_connection_t _edge; /** Nickname of planned exit node -- used with .exit support. */ char *chosen_exit_name; socks_request_t *socks_request; /**< SOCKS structure describing request (AP * only.) */ /* === Isolation related, AP only. === */ /** AP only: based on which factors do we isolate this stream? */ uint8_t isolation_flags; /** AP only: what session group is this stream in? */ int session_group; /** AP only: The newnym epoch in which we created this connection. */ unsigned nym_epoch; /** AP only: The original requested address before we rewrote it. */ char *original_dest_address; /* Other fields to isolate on already exist. The ClientAddr is addr. The ClientProtocol is a combination of type and socks_request-> socks_version. SocksAuth is socks_request->username/password. DestAddr is in socks_request->address. */ /** Number of times we've reassigned this application connection to * a new circuit. We keep track because the timeout is longer if we've * already retried several times. */ uint8_t num_socks_retries; /** For AP connections only: buffer for data that we have sent * optimistically, which we might need to re-send if we have to * retry this connection. */ generic_buffer_t *pending_optimistic_data; /* For AP connections only: buffer for data that we previously sent * optimistically which we are currently re-sending as we retry this * connection. */ generic_buffer_t *sending_optimistic_data; /** If this is a DNSPort connection, this field holds the pending DNS * request that we're going to try to answer. */ struct evdns_server_request *dns_server_request; #define NUM_CIRCUITS_LAUNCHED_THRESHOLD 10 /** Number of times we've launched a circuit to handle this stream. If * it gets too high, that could indicate an inconsistency between our * "launch a circuit to handle this stream" logic and our "attach our * stream to one of the available circuits" logic. */ unsigned int num_circuits_launched:4; /** True iff this stream must attach to a one-hop circuit (e.g. for * begin_dir). */ unsigned int want_onehop:1; /** True iff this stream should use a BEGIN_DIR relay command to establish * itself rather than BEGIN (either via onehop or via a whole circuit). */ unsigned int use_begindir:1; /** For AP connections only. If 1, and we fail to reach the chosen exit, * stop requiring it. */ unsigned int chosen_exit_optional:1; /** For AP connections only. If non-zero, this exit node was picked as * a result of the TrackHostExit, and the value decrements every time * we fail to complete a circuit to our chosen exit -- if it reaches * zero, abandon the associated mapaddress. */ unsigned int chosen_exit_retries:3; /** True iff this is an AP connection that came from a transparent or * NATd connection */ unsigned int is_transparent_ap:1; /** For AP connections only: Set if this connection's target exit node * allows optimistic data (that is, data sent on this stream before * the exit has sent a CONNECTED cell) and we have chosen to use it. */ unsigned int may_use_optimistic_data : 1; } entry_connection_t; /** Subtype of connection_t for an "directory connection" -- that is, an HTTP * connection to retrieve or serve directory material. */ typedef struct dir_connection_t { connection_t _base; /** Which 'resource' did we ask the directory for? This is typically the part * of the URL string that defines, relative to the directory conn purpose, * what thing we want. For example, in router descriptor downloads by * descriptor digest, it contains "d/", then one ore more +-separated * fingerprints. **/ char *requested_resource; unsigned int dirconn_direct:1; /**< Is this dirconn direct, or via Tor? */ /* Used only for server sides of some dir connections, to implement * "spooling" of directory material to the outbuf. Otherwise, we'd have * to append everything to the outbuf in one enormous chunk. */ /** What exactly are we spooling right now? */ enum { DIR_SPOOL_NONE=0, DIR_SPOOL_SERVER_BY_DIGEST, DIR_SPOOL_SERVER_BY_FP, DIR_SPOOL_EXTRA_BY_DIGEST, DIR_SPOOL_EXTRA_BY_FP, DIR_SPOOL_CACHED_DIR, DIR_SPOOL_NETWORKSTATUS, DIR_SPOOL_MICRODESC, /* NOTE: if we add another entry, add another bit. */ } dir_spool_src : 3; /** If we're fetching descriptors, what router purpose shall we assign * to them? */ uint8_t router_purpose; /** List of fingerprints for networkstatuses or descriptors to be spooled. */ smartlist_t *fingerprint_stack; /** A cached_dir_t object that we're currently spooling out */ struct cached_dir_t *cached_dir; /** The current offset into cached_dir. */ off_t cached_dir_offset; /** The zlib object doing on-the-fly compression for spooled data. */ tor_zlib_state_t *zlib_state; /** What rendezvous service are we querying for? */ rend_data_t *rend_data; char identity_digest[DIGEST_LEN]; /**< Hash of the public RSA key for * the directory server's signing key. */ } dir_connection_t; /** Subtype of connection_t for an connection to a controller. */ typedef struct control_connection_t { connection_t _base; uint32_t event_mask; /**< Bitfield: which events does this controller * care about? */ /** True if we have sent a protocolinfo reply on this connection. */ unsigned int have_sent_protocolinfo:1; /** True if we have received a takeownership command on this * connection. */ unsigned int is_owning_control_connection:1; /** If we have sent an AUTHCHALLENGE reply on this connection and * have not received a successful AUTHENTICATE command, points to * the value which the client must send to authenticate itself; * otherwise, NULL. */ char *safecookie_client_hash; /** Amount of space allocated in incoming_cmd. */ uint32_t incoming_cmd_len; /** Number of bytes currently stored in incoming_cmd. */ uint32_t incoming_cmd_cur_len; /** A control command that we're reading from the inbuf, but which has not * yet arrived completely. */ char *incoming_cmd; } control_connection_t; /** Cast a connection_t subtype pointer to a connection_t **/ #define TO_CONN(c) (&(((c)->_base))) /** Helper macro: Given a pointer to to._base, of type from*, return &to. */ #define DOWNCAST(to, ptr) ((to*)SUBTYPE_P(ptr, to, _base)) /** Cast a entry_connection_t subtype pointer to a edge_connection_t **/ #define ENTRY_TO_EDGE_CONN(c) (&(((c))->_edge)) /** Cast a entry_connection_t subtype pointer to a connection_t **/ #define ENTRY_TO_CONN(c) (TO_CONN(ENTRY_TO_EDGE_CONN(c))) /** Convert a connection_t* to an or_connection_t*; assert if the cast is * invalid. */ static or_connection_t *TO_OR_CONN(connection_t *); /** Convert a connection_t* to a dir_connection_t*; assert if the cast is * invalid. */ static dir_connection_t *TO_DIR_CONN(connection_t *); /** Convert a connection_t* to an edge_connection_t*; assert if the cast is * invalid. */ static edge_connection_t *TO_EDGE_CONN(connection_t *); /** Convert a connection_t* to an entry_connection_t*; assert if the cast is * invalid. */ static entry_connection_t *TO_ENTRY_CONN(connection_t *); /** Convert a edge_connection_t* to an entry_connection_t*; assert if the cast * is invalid. */ static entry_connection_t *EDGE_TO_ENTRY_CONN(edge_connection_t *); /** Convert a connection_t* to an control_connection_t*; assert if the cast is * invalid. */ static control_connection_t *TO_CONTROL_CONN(connection_t *); /** Convert a connection_t* to an listener_connection_t*; assert if the cast is * invalid. */ static listener_connection_t *TO_LISTENER_CONN(connection_t *); static INLINE or_connection_t *TO_OR_CONN(connection_t *c) { tor_assert(c->magic == OR_CONNECTION_MAGIC); return DOWNCAST(or_connection_t, c); } static INLINE dir_connection_t *TO_DIR_CONN(connection_t *c) { tor_assert(c->magic == DIR_CONNECTION_MAGIC); return DOWNCAST(dir_connection_t, c); } static INLINE edge_connection_t *TO_EDGE_CONN(connection_t *c) { tor_assert(c->magic == EDGE_CONNECTION_MAGIC || c->magic == ENTRY_CONNECTION_MAGIC); return DOWNCAST(edge_connection_t, c); } static INLINE entry_connection_t *TO_ENTRY_CONN(connection_t *c) { tor_assert(c->magic == ENTRY_CONNECTION_MAGIC); return (entry_connection_t*) SUBTYPE_P(c, entry_connection_t, _edge._base); } static INLINE entry_connection_t *EDGE_TO_ENTRY_CONN(edge_connection_t *c) { tor_assert(c->_base.magic == ENTRY_CONNECTION_MAGIC); return (entry_connection_t*) SUBTYPE_P(c, entry_connection_t, _edge); } static INLINE control_connection_t *TO_CONTROL_CONN(connection_t *c) { tor_assert(c->magic == CONTROL_CONNECTION_MAGIC); return DOWNCAST(control_connection_t, c); } static INLINE listener_connection_t *TO_LISTENER_CONN(connection_t *c) { tor_assert(c->magic == LISTENER_CONNECTION_MAGIC); return DOWNCAST(listener_connection_t, c); } /* Conditional macros to help write code that works whether bufferevents are disabled or not. We can't just write: if (conn->bufev) { do bufferevent stuff; } else { do other stuff; } because the bufferevent stuff won't even compile unless we have a fairly new version of Libevent. Instead, we say: IF_HAS_BUFFEREVENT(conn, { do_bufferevent_stuff } ); or: IF_HAS_BUFFEREVENT(conn, { do bufferevent stuff; }) ELSE_IF_NO_BUFFEREVENT { do non-bufferevent stuff; } If we're compiling with bufferevent support, then the macros expand more or less to: if (conn->bufev) { do_bufferevent_stuff; } else { do non-bufferevent stuff; } and if we aren't using bufferevents, they expand more or less to: { do non-bufferevent stuff; } */ #ifdef USE_BUFFEREVENTS #define HAS_BUFFEREVENT(c) (((c)->bufev) != NULL) #define IF_HAS_BUFFEREVENT(c, stmt) \ if ((c)->bufev) do { \ stmt ; \ } while (0) #define ELSE_IF_NO_BUFFEREVENT ; else #define IF_HAS_NO_BUFFEREVENT(c) \ if (NULL == (c)->bufev) #else #define HAS_BUFFEREVENT(c) (0) #define IF_HAS_BUFFEREVENT(c, stmt) (void)0 #define ELSE_IF_NO_BUFFEREVENT ; #define IF_HAS_NO_BUFFEREVENT(c) \ if (1) #endif /** What action type does an address policy indicate: accept or reject? */ typedef enum { ADDR_POLICY_ACCEPT=1, ADDR_POLICY_REJECT=2, } addr_policy_action_t; /** A reference-counted address policy rule. */ typedef struct addr_policy_t { int refcnt; /**< Reference count */ addr_policy_action_t policy_type:2;/**< What to do when the policy matches.*/ unsigned int is_private:1; /**< True iff this is the pseudo-address, * "private". */ unsigned int is_canonical:1; /**< True iff this policy is the canonical * copy (stored in a hash table to avoid * duplication of common policies) */ maskbits_t maskbits; /**< Accept/reject all addresses a such that the * first maskbits bits of a match * addr. */ tor_addr_t addr; /**< Base address to accept or reject. */ uint16_t prt_min; /**< Lowest port number to accept/reject. */ uint16_t prt_max; /**< Highest port number to accept/reject. */ } addr_policy_t; /** A cached_dir_t represents a cacheable directory object, along with its * compressed form. */ typedef struct cached_dir_t { char *dir; /**< Contents of this object, NUL-terminated. */ char *dir_z; /**< Compressed contents of this object. */ size_t dir_len; /**< Length of dir (not counting its NUL). */ size_t dir_z_len; /**< Length of dir_z. */ time_t published; /**< When was this object published. */ digests_t digests; /**< Digests of this object (networkstatus only) */ int refcnt; /**< Reference count for this cached_dir_t. */ } cached_dir_t; /** Enum used to remember where a signed_descriptor_t is stored and how to * manage the memory for signed_descriptor_body. */ typedef enum { /** The descriptor isn't stored on disk at all: the copy in memory is * canonical; the saved_offset field is meaningless. */ SAVED_NOWHERE=0, /** The descriptor is stored in the cached_routers file: the * signed_descriptor_body is meaningless; the signed_descriptor_len and * saved_offset are used to index into the mmaped cache file. */ SAVED_IN_CACHE, /** The descriptor is stored in the cached_routers.new file: the * signed_descriptor_body and saved_offset fields are both set. */ /* FFFF (We could also mmap the file and grow the mmap as needed, or * lazy-load the descriptor text by using seek and read. We don't, for * now.) */ SAVED_IN_JOURNAL } saved_location_t; /** Enumeration: what kind of download schedule are we using for a given * object? */ typedef enum { DL_SCHED_GENERIC = 0, DL_SCHED_CONSENSUS = 1, DL_SCHED_BRIDGE = 2, } download_schedule_t; /** Information about our plans for retrying downloads for a downloadable * object. */ typedef struct download_status_t { time_t next_attempt_at; /**< When should we try downloading this descriptor * again? */ uint8_t n_download_failures; /**< Number of failures trying to download the * most recent descriptor. */ download_schedule_t schedule : 8; } download_status_t; /** If n_download_failures is this high, the download can never happen. */ #define IMPOSSIBLE_TO_DOWNLOAD 255 /** The max size we expect router descriptor annotations we create to * be. We'll accept larger ones if we see them on disk, but we won't * create any that are larger than this. */ #define ROUTER_ANNOTATION_BUF_LEN 256 /** Information need to cache an onion router's descriptor. */ typedef struct signed_descriptor_t { /** Pointer to the raw server descriptor, preceded by annotations. Not * necessarily NUL-terminated. If saved_location is SAVED_IN_CACHE, this * pointer is null. */ char *signed_descriptor_body; /** Length of the annotations preceding the server descriptor. */ size_t annotations_len; /** Length of the server descriptor. */ size_t signed_descriptor_len; /** Digest of the server descriptor, computed as specified in * dir-spec.txt. */ char signed_descriptor_digest[DIGEST_LEN]; /** Identity digest of the router. */ char identity_digest[DIGEST_LEN]; /** Declared publication time of the descriptor. */ time_t published_on; /** For routerdescs only: digest of the corresponding extrainfo. */ char extra_info_digest[DIGEST_LEN]; /** For routerdescs only: Status of downloading the corresponding * extrainfo. */ download_status_t ei_dl_status; /** Where is the descriptor saved? */ saved_location_t saved_location; /** If saved_location is SAVED_IN_CACHE or SAVED_IN_JOURNAL, the offset of * this descriptor in the corresponding file. */ off_t saved_offset; /** What position is this descriptor within routerlist->routers or * routerlist->old_routers? -1 for none. */ int routerlist_index; /** The valid-until time of the most recent consensus that listed this * descriptor, or a bit after the publication time of the most recent v2 * networkstatus that listed it. 0 for "never listed in a consensus or * status, so far as we know." */ time_t last_listed_as_valid_until; /* If true, we do not ever try to save this object in the cache. */ unsigned int do_not_cache : 1; /* If true, this item is meant to represent an extrainfo. */ unsigned int is_extrainfo : 1; /* If true, we got an extrainfo for this item, and the digest was right, * but it was incompatible. */ unsigned int extrainfo_is_bogus : 1; /* If true, we are willing to transmit this item unencrypted. */ unsigned int send_unencrypted : 1; } signed_descriptor_t; /** A signed integer representing a country code. */ typedef int16_t country_t; /** Information about another onion router in the network. */ typedef struct { signed_descriptor_t cache_info; char *address; /**< Location of OR: either a hostname or an IP address. */ char *nickname; /**< Human-readable OR name. */ uint32_t addr; /**< IPv4 address of OR, in host order. */ uint16_t or_port; /**< Port for TLS connections. */ uint16_t dir_port; /**< Port for HTTP directory connections. */ /** A router's IPv6 address, if it has one. */ /* XXXXX187 Actually these should probably be part of a list of addresses, * not just a special case. Use abstractions to access these; don't do it * directly. */ tor_addr_t ipv6_addr; uint16_t ipv6_orport; crypto_pk_t *onion_pkey; /**< Public RSA key for onions. */ crypto_pk_t *identity_pkey; /**< Public RSA key for signing. */ char *platform; /**< What software/operating system is this OR using? */ /* link info */ uint32_t bandwidthrate; /**< How many bytes does this OR add to its token * bucket per second? */ uint32_t bandwidthburst; /**< How large is this OR's token bucket? */ /** How many bytes/s is this router known to handle? */ uint32_t bandwidthcapacity; smartlist_t *exit_policy; /**< What streams will this OR permit * to exit? NULL for 'reject *:*'. */ long uptime; /**< How many seconds the router claims to have been up */ smartlist_t *declared_family; /**< Nicknames of router which this router * claims are its family. */ char *contact_info; /**< Declared contact info for this router. */ unsigned int is_hibernating:1; /**< Whether the router claims to be * hibernating */ unsigned int caches_extra_info:1; /**< Whether the router says it caches and * serves extrainfo documents. */ unsigned int allow_single_hop_exits:1; /**< Whether the router says * it allows single hop exits. */ unsigned int wants_to_be_hs_dir:1; /**< True iff this router claims to be * a hidden service directory. */ unsigned int policy_is_reject_star:1; /**< True iff the exit policy for this * router rejects everything. */ /** True if, after we have added this router, we should re-launch * tests for it. */ unsigned int needs_retest_if_added:1; /** True if ipv6_addr:ipv6_orport is preferred. */ unsigned int ipv6_preferred:1; /** Tor can use this router for general positions in circuits; we got it * from a directory server as usual, or we're an authority and a server * uploaded it. */ #define ROUTER_PURPOSE_GENERAL 0 /** Tor should avoid using this router for circuit-building: we got it * from a crontroller. If the controller wants to use it, it'll have to * ask for it by identity. */ #define ROUTER_PURPOSE_CONTROLLER 1 /** Tor should use this router only for bridge positions in circuits: we got * it via a directory request from the bridge itself, or a bridge * authority. x*/ #define ROUTER_PURPOSE_BRIDGE 2 /** Tor should not use this router; it was marked in cached-descriptors with * a purpose we didn't recognize. */ #define ROUTER_PURPOSE_UNKNOWN 255 /* In what way did we find out about this router? One of ROUTER_PURPOSE_*. * Routers of different purposes are kept segregated and used for different * things; see notes on ROUTER_PURPOSE_* macros above. */ uint8_t purpose; /* The below items are used only by authdirservers for * reachability testing. */ /** When was the last time we could reach this OR? */ time_t last_reachable; /** When did we start testing reachability for this OR? */ time_t testing_since; } routerinfo_t; /** Information needed to keep and cache a signed extra-info document. */ typedef struct extrainfo_t { signed_descriptor_t cache_info; /** The router's nickname. */ char nickname[MAX_NICKNAME_LEN+1]; /** True iff we found the right key for this extra-info, verified the * signature, and found it to be bad. */ unsigned int bad_sig : 1; /** If present, we didn't have the right key to verify this extra-info, * so this is a copy of the signature in the document. */ char *pending_sig; /** Length of pending_sig. */ size_t pending_sig_len; } extrainfo_t; /** Contents of a single router entry in a network status object. */ typedef struct routerstatus_t { time_t published_on; /**< When was this router published? */ char nickname[MAX_NICKNAME_LEN+1]; /**< The nickname this router says it * has. */ char identity_digest[DIGEST_LEN]; /**< Digest of the router's identity * key. */ /** Digest of the router's most recent descriptor or microdescriptor. * If it's a descriptor, we only use the first DIGEST_LEN bytes. */ char descriptor_digest[DIGEST256_LEN]; uint32_t addr; /**< IPv4 address for this router. */ uint16_t or_port; /**< OR port for this router. */ uint16_t dir_port; /**< Directory port for this router. */ unsigned int is_authority:1; /**< True iff this router is an authority. */ unsigned int is_exit:1; /**< True iff this router is a good exit. */ unsigned int is_stable:1; /**< True iff this router stays up a long time. */ unsigned int is_fast:1; /**< True iff this router has good bandwidth. */ /** True iff this router is called 'running' in the consensus. We give it * this funny name so that we don't accidentally use this bit as a view of * whether we think the router is *currently* running. If that's what you * want to know, look at is_running in node_t. */ unsigned int is_flagged_running:1; unsigned int is_named:1; /**< True iff "nickname" belongs to this router. */ unsigned int is_unnamed:1; /**< True iff "nickname" belongs to another * router. */ unsigned int is_valid:1; /**< True iff this router isn't invalid. */ unsigned int is_v2_dir:1; /**< True iff this router can serve directory * information with v2 of the directory * protocol. (All directory caches cache v1 * directories.) */ unsigned int is_possible_guard:1; /**< True iff this router would be a good * choice as an entry guard. */ unsigned int is_bad_exit:1; /**< True iff this node is a bad choice for * an exit node. */ unsigned int is_bad_directory:1; /**< Do we think this directory is junky, * underpowered, or otherwise useless? */ unsigned int is_hs_dir:1; /**< True iff this router is a v2-or-later hidden * service directory. */ /** True iff we know version info for this router. (i.e., a "v" entry was * included.) We'll replace all these with a big tor_version_t or a char[] * if the number of traits we care about ever becomes incredibly big. */ unsigned int version_known:1; /** True iff this router is a version that supports BEGIN_DIR cells. */ unsigned int version_supports_begindir:1; /** True iff this router is a version that supports conditional consensus * downloads (signed by list of authorities). */ unsigned int version_supports_conditional_consensus:1; /** True iff this router is a version that we can post extrainfo docs to. */ unsigned int version_supports_extrainfo_upload:1; /** True iff this router is a version that, if it caches directory info, * we can get v3 downloads from. */ unsigned int version_supports_v3_dir:1; /** True iff this router is a version that, if it caches directory info, * we can get microdescriptors from. */ unsigned int version_supports_microdesc_cache:1; /** True iff this router is a version that allows DATA cells to arrive on * a stream before it has sent a CONNECTED cell. */ unsigned int version_supports_optimistic_data:1; unsigned int has_bandwidth:1; /**< The vote/consensus had bw info */ unsigned int has_exitsummary:1; /**< The vote/consensus had exit summaries */ unsigned int has_measured_bw:1; /**< The vote/consensus had a measured bw */ uint32_t measured_bw; /**< Measured bandwidth (capacity) of the router */ uint32_t bandwidth; /**< Bandwidth (capacity) of the router as reported in * the vote/consensus, in kilobytes/sec. */ char *exitsummary; /**< exit policy summary - * XXX weasel: this probably should not stay a string. */ /* ---- The fields below aren't derived from the networkstatus; they * hold local information only. */ /** True if we, as a directory mirror, want to download the corresponding * routerinfo from the authority who gave us this routerstatus. (That is, * if we don't have the routerinfo, and if we haven't already tried to get it * from this authority.) Applies in v2 networkstatus document only. */ unsigned int need_to_mirror:1; time_t last_dir_503_at; /**< When did this router last tell us that it * was too busy to serve directory info? */ download_status_t dl_status; } routerstatus_t; /** A single entry in a parsed policy summary, describing a range of ports. */ typedef struct short_policy_entry_t { uint16_t min_port, max_port; } short_policy_entry_t; /** A short_poliy_t is the parsed version of a policy summary. */ typedef struct short_policy_t { /** True if the members of 'entries' are port ranges to accept; false if * they are port ranges to reject */ unsigned int is_accept : 1; /** The actual number of values in 'entries'. */ unsigned int n_entries : 31; /** An array of 0 or more short_policy_entry_t values, each describing a * range of ports that this policy accepts or rejects (depending on the * value of is_accept). */ short_policy_entry_t entries[FLEXIBLE_ARRAY_MEMBER]; } short_policy_t; /** A microdescriptor is the smallest amount of information needed to build a * circuit through a router. They are generated by the directory authorities, * using information from the uploaded routerinfo documents. They are not * self-signed, but are rather authenticated by having their hash in a signed * networkstatus document. */ typedef struct microdesc_t { /** Hashtable node, used to look up the microdesc by its digest. */ HT_ENTRY(microdesc_t) node; /* Cache information */ /** When was this microdescriptor last listed in a consensus document? * Once a microdesc has been unlisted long enough, we can drop it. */ time_t last_listed; /** Where is this microdescriptor currently stored? */ saved_location_t saved_location : 3; /** If true, do not attempt to cache this microdescriptor on disk. */ unsigned int no_save : 1; /** If true, this microdesc has an entry in the microdesc_map */ unsigned int held_in_map : 1; /** Reference count: how many node_ts have a reference to this microdesc? */ unsigned int held_by_nodes; /** If saved_location == SAVED_IN_CACHE, this field holds the offset of the * microdescriptor in the cache. */ off_t off; /* The string containing the microdesc. */ /** A pointer to the encoded body of the microdescriptor. If the * saved_location is SAVED_IN_CACHE, then the body is a pointer into an * mmap'd region. Otherwise, it is a malloc'd string. The string might not * be NUL-terminated; take the length from bodylen. */ char *body; /** The length of the microdescriptor in body. */ size_t bodylen; /** A SHA256-digest of the microdescriptor. */ char digest[DIGEST256_LEN]; /* Fields in the microdescriptor. */ /** As routerinfo_t.onion_pkey */ crypto_pk_t *onion_pkey; /** As routerinfo_t.family */ smartlist_t *family; /** Exit policy summary */ short_policy_t *exit_policy; } microdesc_t; /** A node_t represents a Tor router. * * Specifically, a node_t is a Tor router as we are using it: a router that * we are considering for circuits, connections, and so on. A node_t is a * thin wrapper around the routerstatus, routerinfo, and microdesc for a * single wrapper, and provides a consistent interface for all of them. * * Also, a node_t has mutable state. While a routerinfo, a routerstatus, * and a microdesc have[*] only the information read from a router * descriptor, a consensus entry, and a microdescriptor (respectively)... * a node_t has flags based on *our own current opinion* of the node. * * [*] Actually, there is some leftover information in each that is mutable. * We should try to excise that. */ typedef struct node_t { /* Indexing information */ /** Used to look up the node_t by its identity digest. */ HT_ENTRY(node_t) ht_ent; /** Position of the node within the list of nodes */ int nodelist_idx; /** The identity digest of this node_t. No more than one node_t per * identity may exist at a time. */ char identity[DIGEST_LEN]; microdesc_t *md; routerinfo_t *ri; routerstatus_t *rs; /* local info: copied from routerstatus, then possibly frobbed based * on experience. Authorities set this stuff directly. */ unsigned int is_running:1; /**< As far as we know, is this OR currently * running? */ unsigned int is_valid:1; /**< Has a trusted dirserver validated this OR? * (For Authdir: Have we validated this OR?) */ unsigned int is_fast:1; /** Do we think this is a fast OR? */ unsigned int is_stable:1; /** Do we think this is a stable OR? */ unsigned int is_possible_guard:1; /**< Do we think this is an OK guard? */ unsigned int is_exit:1; /**< Do we think this is an OK exit? */ unsigned int is_bad_exit:1; /**< Do we think this exit is censored, borked, * or otherwise nasty? */ unsigned int is_bad_directory:1; /**< Do we think this directory is junky, * underpowered, or otherwise useless? */ unsigned int is_hs_dir:1; /**< True iff this router is a hidden service * directory according to the authorities. */ /* Local info: warning state. */ unsigned int name_lookup_warned:1; /**< Have we warned the user for referring * to this (unnamed) router by nickname? */ /** Local info: we treat this node as if it rejects everything */ unsigned int rejects_all:1; /* Local info: derived. */ /** According to the geoip db what country is this router in? */ country_t country; } node_t; /** How many times will we try to download a router's descriptor before giving * up? */ #define MAX_ROUTERDESC_DOWNLOAD_FAILURES 8 /** How many times will we try to download a microdescriptor before giving * up? */ #define MAX_MICRODESC_DOWNLOAD_FAILURES 8 /** Contents of a v2 (non-consensus, non-vote) network status object. */ typedef struct networkstatus_v2_t { /** When did we receive the network-status document? */ time_t received_on; /** What was the digest of the document? */ char networkstatus_digest[DIGEST_LEN]; /* These fields come from the actual network-status document.*/ time_t published_on; /**< Declared publication date. */ char *source_address; /**< Canonical directory server hostname. */ uint32_t source_addr; /**< Canonical directory server IP. */ uint16_t source_dirport; /**< Canonical directory server dirport. */ unsigned int binds_names:1; /**< True iff this directory server binds * names. */ unsigned int recommends_versions:1; /**< True iff this directory server * recommends client and server software * versions. */ unsigned int lists_bad_exits:1; /**< True iff this directory server marks * malfunctioning exits as bad. */ /** True iff this directory server marks malfunctioning directories as * bad. */ unsigned int lists_bad_directories:1; char identity_digest[DIGEST_LEN]; /**< Digest of signing key. */ char *contact; /**< How to contact directory admin? (may be NULL). */ crypto_pk_t *signing_key; /**< Key used to sign this directory. */ char *client_versions; /**< comma-separated list of recommended client * versions. */ char *server_versions; /**< comma-separated list of recommended server * versions. */ smartlist_t *entries; /**< List of routerstatus_t*. This list is kept * sorted by identity_digest. */ } networkstatus_v2_t; /** Linked list of microdesc hash lines for a single router in a directory * vote. */ typedef struct vote_microdesc_hash_t { /** Next element in the list, or NULL. */ struct vote_microdesc_hash_t *next; /** The raw contents of the microdesc hash line, excluding the "m". */ char *microdesc_hash_line; } vote_microdesc_hash_t; /** The claim about a single router, made in a vote. */ typedef struct vote_routerstatus_t { routerstatus_t status; /**< Underlying 'status' object for this router. * Flags are redundant. */ uint64_t flags; /**< Bit-field for all recognized flags; index into * networkstatus_t.known_flags. */ char *version; /**< The version that the authority says this router is * running. */ /** The hash or hashes that the authority claims this microdesc has. */ vote_microdesc_hash_t *microdesc; } vote_routerstatus_t; /** A signature of some document by an authority. */ typedef struct document_signature_t { /** Declared SHA-1 digest of this voter's identity key */ char identity_digest[DIGEST_LEN]; /** Declared SHA-1 digest of signing key used by this voter. */ char signing_key_digest[DIGEST_LEN]; /** Algorithm used to compute the digest of the document. */ digest_algorithm_t alg; /** Signature of the signed thing. */ char *signature; /** Length of signature */ int signature_len; unsigned int bad_signature : 1; /**< Set to true if we've tried to verify * the sig, and we know it's bad. */ unsigned int good_signature : 1; /**< Set to true if we've verified the sig * as good. */ } document_signature_t; /** Information about a single voter in a vote or a consensus. */ typedef struct networkstatus_voter_info_t { /** Declared SHA-1 digest of this voter's identity key */ char identity_digest[DIGEST_LEN]; char *nickname; /**< Nickname of this voter */ /** Digest of this voter's "legacy" identity key, if any. In vote only; for * consensuses, we treat legacy keys as additional signers. */ char legacy_id_digest[DIGEST_LEN]; char *address; /**< Address of this voter, in string format. */ uint32_t addr; /**< Address of this voter, in IPv4, in host order. */ uint16_t dir_port; /**< Directory port of this voter */ uint16_t or_port; /**< OR port of this voter */ char *contact; /**< Contact information for this voter. */ char vote_digest[DIGEST_LEN]; /**< Digest of this voter's vote, as signed. */ /* Nothing from here on is signed. */ /** The signature of the document and the signature's status. */ smartlist_t *sigs; } networkstatus_voter_info_t; /** Enumerates the possible seriousness values of a networkstatus document. */ typedef enum { NS_TYPE_VOTE, NS_TYPE_CONSENSUS, NS_TYPE_OPINION, } networkstatus_type_t; /** Enumerates recognized flavors of a consensus networkstatus document. All * flavors of a consensus are generated from the same set of votes, but they * present different types information to different versions of Tor. */ typedef enum { FLAV_NS = 0, FLAV_MICRODESC = 1, } consensus_flavor_t; /** How many different consensus flavors are there? */ #define N_CONSENSUS_FLAVORS ((int)(FLAV_MICRODESC)+1) /** A common structure to hold a v3 network status vote, or a v3 network * status consensus. */ typedef struct networkstatus_t { networkstatus_type_t type : 8; /**< Vote, consensus, or opinion? */ consensus_flavor_t flavor : 8; /**< If a consensus, what kind? */ time_t published; /**< Vote only: Time when vote was written. */ time_t valid_after; /**< Time after which this vote or consensus applies. */ time_t fresh_until; /**< Time before which this is the most recent vote or * consensus. */ time_t valid_until; /**< Time after which this vote or consensus should not * be used. */ /** Consensus only: what method was used to produce this consensus? */ int consensus_method; /** Vote only: what methods is this voter willing to use? */ smartlist_t *supported_methods; /** How long does this vote/consensus claim that authorities take to * distribute their votes to one another? */ int vote_seconds; /** How long does this vote/consensus claim that authorities take to * distribute their consensus signatures to one another? */ int dist_seconds; /** Comma-separated list of recommended client software, or NULL if this * voter has no opinion. */ char *client_versions; char *server_versions; /** List of flags that this vote/consensus applies to routers. If a flag is * not listed here, the voter has no opinion on what its value should be. */ smartlist_t *known_flags; /** List of key=value strings for the parameters in this vote or * consensus, sorted by key. */ smartlist_t *net_params; /** List of key=value strings for the bw weight parameters in the * consensus. */ smartlist_t *weight_params; /** List of networkstatus_voter_info_t. For a vote, only one element * is included. For a consensus, one element is included for every voter * whose vote contributed to the consensus. */ smartlist_t *voters; struct authority_cert_t *cert; /**< Vote only: the voter's certificate. */ /** Digests of this document, as signed. */ digests_t digests; /** List of router statuses, sorted by identity digest. For a vote, * the elements are vote_routerstatus_t; for a consensus, the elements * are routerstatus_t. */ smartlist_t *routerstatus_list; /** If present, a map from descriptor digest to elements of * routerstatus_list. */ digestmap_t *desc_digest_map; } networkstatus_t; /** A set of signatures for a networkstatus consensus. Unless otherwise * noted, all fields are as for networkstatus_t. */ typedef struct ns_detached_signatures_t { time_t valid_after; time_t fresh_until; time_t valid_until; strmap_t *digests; /**< Map from flavor name to digestset_t */ strmap_t *signatures; /**< Map from flavor name to list of * document_signature_t */ } ns_detached_signatures_t; /** Allowable types of desc_store_t. */ typedef enum store_type_t { ROUTER_STORE = 0, EXTRAINFO_STORE = 1 } store_type_t; /** A 'store' is a set of descriptors saved on disk, with accompanying * journal, mmaped as needed, rebuilt as needed. */ typedef struct desc_store_t { /** Filename (within DataDir) for the store. We append .tmp to this * filename for a temporary file when rebuilding the store, and .new to this * filename for the journal. */ const char *fname_base; /** Alternative (obsolete) value for fname_base: if the file named by * fname_base isn't present, we read from here instead, but we never write * here. */ const char *fname_alt_base; /** Human-readable description of what this store contains. */ const char *description; tor_mmap_t *mmap; /**< A mmap for the main file in the store. */ store_type_t type; /**< What's stored in this store? */ /** The size of the router log, in bytes. */ size_t journal_len; /** The size of the router store, in bytes. */ size_t store_len; /** Total bytes dropped since last rebuild: this is space currently * used in the cache and the journal that could be freed by a rebuild. */ size_t bytes_dropped; } desc_store_t; /** Contents of a directory of onion routers. */ typedef struct { /** Map from server identity digest to a member of routers. */ struct digest_ri_map_t *identity_map; /** Map from server descriptor digest to a signed_descriptor_t from * routers or old_routers. */ struct digest_sd_map_t *desc_digest_map; /** Map from extra-info digest to an extrainfo_t. Only exists for * routers in routers or old_routers. */ struct digest_ei_map_t *extra_info_map; /** Map from extra-info digests to a signed_descriptor_t for a router * descriptor having that extra-info digest. Only exists for * routers in routers or old_routers. */ struct digest_sd_map_t *desc_by_eid_map; /** List of routerinfo_t for all currently live routers we know. */ smartlist_t *routers; /** List of signed_descriptor_t for older router descriptors we're * caching. */ smartlist_t *old_routers; /** Store holding server descriptors. If present, any router whose * cache_info.saved_location == SAVED_IN_CACHE is stored in this file * starting at cache_info.saved_offset */ desc_store_t desc_store; /** Store holding extra-info documents. */ desc_store_t extrainfo_store; } routerlist_t; /** Information on router used when extending a circuit. We don't need a * full routerinfo_t to extend: we only need addr:port:keyid to build an OR * connection, and onion_key to create the onionskin. Note that for onehop * general-purpose tunnels, the onion_key is NULL. */ typedef struct extend_info_t { char nickname[MAX_HEX_NICKNAME_LEN+1]; /**< This router's nickname for * display. */ char identity_digest[DIGEST_LEN]; /**< Hash of this router's identity key. */ uint16_t port; /**< OR port. */ tor_addr_t addr; /**< IP address. */ crypto_pk_t *onion_key; /**< Current onionskin key. */ } extend_info_t; /** Certificate for v3 directory protocol: binds long-term authority identity * keys to medium-term authority signing keys. */ typedef struct authority_cert_t { /** Information relating to caching this cert on disk and looking it up. */ signed_descriptor_t cache_info; /** This authority's long-term authority identity key. */ crypto_pk_t *identity_key; /** This authority's medium-term signing key. */ crypto_pk_t *signing_key; /** The digest of signing_key */ char signing_key_digest[DIGEST_LEN]; /** The listed expiration time of this certificate. */ time_t expires; /** This authority's IPv4 address, in host order. */ uint32_t addr; /** This authority's directory port. */ uint16_t dir_port; /** True iff this certificate was cross-certified by signing the identity * key with the signing key. */ uint8_t is_cross_certified; } authority_cert_t; /** Bitfield enum type listing types of information that directory authorities * can be authoritative about, and that directory caches may or may not cache. * * Note that the granularity here is based on authority granularity and on * cache capabilities. Thus, one particular bit may correspond in practice to * a few types of directory info, so long as every authority that pronounces * officially about one of the types prounounces officially about all of them, * and so long as every cache that caches one of them caches all of them. */ typedef enum { NO_DIRINFO = 0, /** Serves/signs v1 directory information: Big lists of routers, and short * routerstatus documents. */ V1_DIRINFO = 1 << 0, /** Serves/signs v2 directory information: i.e. v2 networkstatus documents */ V2_DIRINFO = 1 << 1, /** Serves/signs v3 directory information: votes, consensuses, certs */ V3_DIRINFO = 1 << 2, /** Serves hidden service descriptors. */ HIDSERV_DIRINFO = 1 << 3, /** Serves bridge descriptors. */ BRIDGE_DIRINFO = 1 << 4, /** Serves extrainfo documents. */ EXTRAINFO_DIRINFO=1 << 5, /** Serves microdescriptors. */ MICRODESC_DIRINFO=1 << 6, } dirinfo_type_t; #define CRYPT_PATH_MAGIC 0x70127012u /** Holds accounting information for a single step in the layered encryption * performed by a circuit. Used only at the client edge of a circuit. */ typedef struct crypt_path_t { uint32_t magic; /* crypto environments */ /** Encryption key and counter for cells heading towards the OR at this * step. */ crypto_cipher_t *f_crypto; /** Encryption key and counter for cells heading back from the OR at this * step. */ crypto_cipher_t *b_crypto; /** Digest state for cells heading towards the OR at this step. */ crypto_digest_t *f_digest; /* for integrity checking */ /** Digest state for cells heading away from the OR at this step. */ crypto_digest_t *b_digest; /** Current state of Diffie-Hellman key negotiation with the OR at this * step. */ crypto_dh_t *dh_handshake_state; /** Current state of 'fast' (non-PK) key negotiation with the OR at this * step. Used to save CPU when TLS is already providing all the * authentication, secrecy, and integrity we need, and we're already * distinguishable from an OR. */ uint8_t fast_handshake_state[DIGEST_LEN]; /** Negotiated key material shared with the OR at this step. */ char handshake_digest[DIGEST_LEN];/* KH in tor-spec.txt */ /** Information to extend to the OR at this step. */ extend_info_t *extend_info; /** Is the circuit built to this step? Must be one of: * - CPATH_STATE_CLOSED (The circuit has not been extended to this step) * - CPATH_STATE_AWAITING_KEYS (We have sent an EXTEND/CREATE to this step * and not received an EXTENDED/CREATED) * - CPATH_STATE_OPEN (The circuit has been extended to this step) */ uint8_t state; #define CPATH_STATE_CLOSED 0 #define CPATH_STATE_AWAITING_KEYS 1 #define CPATH_STATE_OPEN 2 struct crypt_path_t *next; /**< Link to next crypt_path_t in the circuit. * (The list is circular, so the last node * links to the first.) */ struct crypt_path_t *prev; /**< Link to previous crypt_path_t in the * circuit. */ int package_window; /**< How many cells are we allowed to originate ending * at this step? */ int deliver_window; /**< How many cells are we willing to deliver originating * at this step? */ } crypt_path_t; /** A reference-counted pointer to a crypt_path_t, used only to share * the final rendezvous cpath to be used on a service-side rendezvous * circuit among multiple circuits built in parallel to the same * destination rendezvous point. */ typedef struct { /** The reference count. */ unsigned int refcount; /** The pointer. Set to NULL when the crypt_path_t is put into use * on an opened rendezvous circuit. */ crypt_path_t *cpath; } crypt_path_reference_t; #define CPATH_KEY_MATERIAL_LEN (20*2+16*2) #define DH_KEY_LEN DH_BYTES #define ONIONSKIN_CHALLENGE_LEN (PKCS1_OAEP_PADDING_OVERHEAD+\ CIPHER_KEY_LEN+\ DH_KEY_LEN) #define ONIONSKIN_REPLY_LEN (DH_KEY_LEN+DIGEST_LEN) /** Information used to build a circuit. */ typedef struct { /** Intended length of the final circuit. */ int desired_path_len; /** How to extend to the planned exit node. */ extend_info_t *chosen_exit; /** Whether every node in the circ must have adequate uptime. */ unsigned int need_uptime : 1; /** Whether every node in the circ must have adequate capacity. */ unsigned int need_capacity : 1; /** Whether the last hop was picked with exiting in mind. */ unsigned int is_internal : 1; /** Did we pick this as a one-hop tunnel (not safe for other streams)? * These are for encrypted dir conns that exit to this router, not * for arbitrary exits from the circuit. */ unsigned int onehop_tunnel : 1; /** The crypt_path_t to append after rendezvous: used for rendezvous. */ crypt_path_t *pending_final_cpath; /** A ref-counted reference to the crypt_path_t to append after * rendezvous; used on the service side. */ crypt_path_reference_t *service_pending_final_cpath_ref; /** How many times has building a circuit for this task failed? */ int failure_count; /** At what time should we give up on this task? */ time_t expiry_time; } cpath_build_state_t; /** * The cell_ewma_t structure keeps track of how many cells a circuit has * transferred recently. It keeps an EWMA (exponentially weighted moving * average) of the number of cells flushed from the circuit queue onto a * connection in connection_or_flush_from_first_active_circuit(). */ typedef struct { /** The last 'tick' at which we recalibrated cell_count. * * A cell sent at exactly the start of this tick has weight 1.0. Cells sent * since the start of this tick have weight greater than 1.0; ones sent * earlier have less weight. */ unsigned last_adjusted_tick; /** The EWMA of the cell count. */ double cell_count; /** True iff this is the cell count for a circuit's previous * connection. */ unsigned int is_for_p_conn : 1; /** The position of the circuit within the OR connection's priority * queue. */ int heap_index; } cell_ewma_t; #define ORIGIN_CIRCUIT_MAGIC 0x35315243u #define OR_CIRCUIT_MAGIC 0x98ABC04Fu /** * A circuit is a path over the onion routing * network. Applications can connect to one end of the circuit, and can * create exit connections at the other end of the circuit. AP and exit * connections have only one circuit associated with them (and thus these * connection types are closed when the circuit is closed), whereas * OR connections multiplex many circuits at once, and stay standing even * when there are no circuits running over them. * * A circuit_t structure can fill one of two roles. First, a or_circuit_t * links two connections together: either an edge connection and an OR * connection, or two OR connections. (When joined to an OR connection, a * circuit_t affects only cells sent to a particular circID on that * connection. When joined to an edge connection, a circuit_t affects all * data.) * Second, an origin_circuit_t holds the cipher keys and state for sending data * along a given circuit. At the OP, it has a sequence of ciphers, each * of which is shared with a single OR along the circuit. Separate * ciphers are used for data going "forward" (away from the OP) and * "backward" (towards the OP). At the OR, a circuit has only two stream * ciphers: one for data going forward, and one for data going backward. */ typedef struct circuit_t { uint32_t magic; /**< For memory and type debugging: must equal * ORIGIN_CIRCUIT_MAGIC or OR_CIRCUIT_MAGIC. */ /** Queue of cells waiting to be transmitted on n_conn. */ cell_queue_t n_conn_cells; /** The OR connection that is next in this circuit. */ or_connection_t *n_conn; /** The circuit_id used in the next (forward) hop of this circuit. */ circid_t n_circ_id; /** The hop to which we want to extend this circuit. Should be NULL if * the circuit has attached to a connection. */ extend_info_t *n_hop; /** True iff we are waiting for n_conn_cells to become less full before * allowing p_streams to add any more cells. (Origin circuit only.) */ unsigned int streams_blocked_on_n_conn : 1; /** True iff we are waiting for p_conn_cells to become less full before * allowing n_streams to add any more cells. (OR circuit only.) */ unsigned int streams_blocked_on_p_conn : 1; uint8_t state; /**< Current status of this circuit. */ uint8_t purpose; /**< Why are we creating this circuit? */ /** How many relay data cells can we package (read from edge streams) * on this circuit before we receive a circuit-level sendme cell asking * for more? */ int package_window; /** How many relay data cells will we deliver (write to edge streams) * on this circuit? When deliver_window gets low, we send some * circuit-level sendme cells to indicate that we're willing to accept * more. */ int deliver_window; /** For storage while n_conn is pending * (state CIRCUIT_STATE_OR_WAIT). When defined, it is always * length ONIONSKIN_CHALLENGE_LEN. */ char *n_conn_onionskin; /** When was this circuit created? We keep this timestamp with a higher * resolution than most so that the circuit-build-time tracking code can * get millisecond resolution. */ struct timeval timestamp_created; /** When the circuit was first used, or 0 if the circuit is clean. * * XXXX023 Note that some code will artifically adjust this value backward * in time in order to indicate that a circuit shouldn't be used for new * streams, but that it can stay alive as long as it has streams on it. * That's a kludge we should fix. * * XXX023 The CBT code uses this field to record when HS-related * circuits entered certain states. This usage probably won't * interfere with this field's primary purpose, but we should * document it more thoroughly to make sure of that. */ time_t timestamp_dirty; uint16_t marked_for_close; /**< Should we close this circuit at the end of * the main loop? (If true, holds the line number * where this circuit was marked.) */ const char *marked_for_close_file; /**< For debugging: in which file was this * circuit marked for close? */ /** Next circuit in the doubly-linked ring of circuits waiting to add * cells to n_conn. NULL if we have no cells pending, or if we're not * linked to an OR connection. */ struct circuit_t *next_active_on_n_conn; /** Previous circuit in the doubly-linked ring of circuits waiting to add * cells to n_conn. NULL if we have no cells pending, or if we're not * linked to an OR connection. */ struct circuit_t *prev_active_on_n_conn; struct circuit_t *next; /**< Next circuit in linked list of all circuits. */ /** Unique ID for measuring tunneled network status requests. */ uint64_t dirreq_id; /** The EWMA count for the number of cells flushed from the * n_conn_cells queue. Used to determine which circuit to flush from next. */ cell_ewma_t n_cell_ewma; } circuit_t; /** Largest number of relay_early cells that we can send on a given * circuit. */ #define MAX_RELAY_EARLY_CELLS_PER_CIRCUIT 8 /** An origin_circuit_t holds data necessary to build and use a circuit. */ typedef struct origin_circuit_t { circuit_t _base; /** Linked list of AP streams (or EXIT streams if hidden service) * associated with this circuit. */ edge_connection_t *p_streams; /** Build state for this circuit. It includes the intended path * length, the chosen exit router, rendezvous information, etc. */ cpath_build_state_t *build_state; /** The doubly-linked list of crypt_path_t entries, one per hop, * for this circuit. This includes ciphers for each hop, * integrity-checking digests for each hop, and package/delivery * windows for each hop. */ crypt_path_t *cpath; /** Holds all rendezvous data on either client or service side. */ rend_data_t *rend_data; /** How many more relay_early cells can we send on this circuit, according * to the specification? */ unsigned int remaining_relay_early_cells : 4; /** Set if this circuit is insanely old and we already informed the user */ unsigned int is_ancient : 1; /** Set if this circuit has already been opened. Used to detect * cannibalized circuits. */ unsigned int has_opened : 1; /** Set iff this is a hidden-service circuit which has timed out * according to our current circuit-build timeout, but which has * been kept around because it might still succeed in connecting to * its destination, and which is not a fully-connected rendezvous * circuit. * * (We clear this flag for client-side rendezvous circuits when they * are 'joined' to the other side's rendezvous circuit, so that * connection_ap_handshake_attach_circuit can put client streams on * the circuit. We also clear this flag for service-side rendezvous * circuits when they are 'joined' to a client's rend circ, but only * for symmetry with the client case. Client-side introduction * circuits are closed when we get a joined rend circ, and * service-side introduction circuits never have this flag set.) */ unsigned int hs_circ_has_timed_out : 1; /** Set iff this is a service-side rendezvous circuit for which a * new connection attempt has been launched. We consider launching * a new service-side rend circ to a client when the previous one * fails; now that we don't necessarily close a service-side rend * circ when we launch a new one to the same client, this flag keeps * us from launching two retries for the same failed rend circ. */ unsigned int hs_service_side_rend_circ_has_been_relaunched : 1; /** What commands were sent over this circuit that decremented the * RELAY_EARLY counter? This is for debugging task 878. */ uint8_t relay_early_commands[MAX_RELAY_EARLY_CELLS_PER_CIRCUIT]; /** How many RELAY_EARLY cells have been sent over this circuit? This is * for debugging task 878, too. */ int relay_early_cells_sent; /** The next stream_id that will be tried when we're attempting to * construct a new AP stream originating at this circuit. */ streamid_t next_stream_id; /* The intro key replaces the hidden service's public key if purpose is * S_ESTABLISH_INTRO or S_INTRO, provided that no unversioned rendezvous * descriptor is used. */ crypto_pk_t *intro_key; /** Quasi-global identifier for this circuit; used for control.c */ /* XXXX NM This can get re-used after 2**32 circuits. */ uint32_t global_identifier; /** True if we have associated one stream to this circuit, thereby setting * the isolation paramaters for this circuit. Note that this doesn't * necessarily mean that we've attached any streams to the circuit: * we may only have marked up this circuit during the launch process. */ unsigned int isolation_values_set : 1; /** True iff any stream has ever been attached to this circuit. * * In a better world we could use timestamp_dirty for this, but * timestamp_dirty is far too overloaded at the moment. */ unsigned int isolation_any_streams_attached : 1; /** A bitfield of ISO_* flags for every isolation field such that this * circuit has had streams with more than one value for that field * attached to it. */ uint8_t isolation_flags_mixed; /** @name Isolation parameters * * If any streams have been associated with this circ (isolation_values_set * == 1), and all streams associated with the circuit have had the same * value for some field ((isolation_flags_mixed & ISO_FOO) == 0), then these * elements hold the value for that field. * * Note again that "associated" is not the same as "attached": we * preliminarily associate streams with a circuit while the circuit is being * launched, so that we can tell whether we need to launch more circuits. * * @{ */ uint8_t client_proto_type; uint8_t client_proto_socksver; uint16_t dest_port; tor_addr_t client_addr; char *dest_address; int session_group; unsigned nym_epoch; size_t socks_username_len; uint8_t socks_password_len; /* Note that the next two values are NOT NUL-terminated; see socks_username_len and socks_password_len for their lengths. */ char *socks_username; char *socks_password; /** Global identifier for the first stream attached here; used by * ISO_STREAM. */ uint64_t associated_isolated_stream_global_id; /**@}*/ } origin_circuit_t; /** An or_circuit_t holds information needed to implement a circuit at an * OR. */ typedef struct or_circuit_t { circuit_t _base; /** Next circuit in the doubly-linked ring of circuits waiting to add * cells to p_conn. NULL if we have no cells pending, or if we're not * linked to an OR connection. */ struct circuit_t *next_active_on_p_conn; /** Previous circuit in the doubly-linked ring of circuits waiting to add * cells to p_conn. NULL if we have no cells pending, or if we're not * linked to an OR connection. */ struct circuit_t *prev_active_on_p_conn; /** The circuit_id used in the previous (backward) hop of this circuit. */ circid_t p_circ_id; /** Queue of cells waiting to be transmitted on p_conn. */ cell_queue_t p_conn_cells; /** The OR connection that is previous in this circuit. */ or_connection_t *p_conn; /** Linked list of Exit streams associated with this circuit. */ edge_connection_t *n_streams; /** Linked list of Exit streams associated with this circuit that are * still being resolved. */ edge_connection_t *resolving_streams; /** The cipher used by intermediate hops for cells heading toward the * OP. */ crypto_cipher_t *p_crypto; /** The cipher used by intermediate hops for cells heading away from * the OP. */ crypto_cipher_t *n_crypto; /** The integrity-checking digest used by intermediate hops, for * cells packaged here and heading towards the OP. */ crypto_digest_t *p_digest; /** The integrity-checking digest used by intermediate hops, for * cells packaged at the OP and arriving here. */ crypto_digest_t *n_digest; /** Points to spliced circuit if purpose is REND_ESTABLISHED, and circuit * is not marked for close. */ struct or_circuit_t *rend_splice; #if REND_COOKIE_LEN >= DIGEST_LEN #define REND_TOKEN_LEN REND_COOKIE_LEN #else #define REND_TOKEN_LEN DIGEST_LEN #endif /** A hash of location-hidden service's PK if purpose is INTRO_POINT, or a * rendezvous cookie if purpose is REND_POINT_WAITING. Filled with zeroes * otherwise. * ???? move to a subtype or adjunct structure? Wastes 20 bytes. -NM */ char rend_token[REND_TOKEN_LEN]; /* ???? move to a subtype or adjunct structure? Wastes 20 bytes -NM */ char handshake_digest[DIGEST_LEN]; /**< Stores KH for the handshake. */ /** How many more relay_early cells can we send on this circuit, according * to the specification? */ unsigned int remaining_relay_early_cells : 4; /** True iff this circuit was made with a CREATE_FAST cell. */ unsigned int is_first_hop : 1; /** Number of cells that were removed from circuit queue; reset every * time when writing buffer stats to disk. */ uint32_t processed_cells; /** Total time in milliseconds that cells spent in both app-ward and * exit-ward queues of this circuit; reset every time when writing * buffer stats to disk. */ uint64_t total_cell_waiting_time; /** The EWMA count for the number of cells flushed from the * p_conn_cells queue. */ cell_ewma_t p_cell_ewma; } or_circuit_t; /** Convert a circuit subtype to a circuit_t. */ #define TO_CIRCUIT(x) (&((x)->_base)) /** Convert a circuit_t* to a pointer to the enclosing or_circuit_t. Assert * if the cast is impossible. */ static or_circuit_t *TO_OR_CIRCUIT(circuit_t *); /** Convert a circuit_t* to a pointer to the enclosing origin_circuit_t. * Assert if the cast is impossible. */ static origin_circuit_t *TO_ORIGIN_CIRCUIT(circuit_t *); static INLINE or_circuit_t *TO_OR_CIRCUIT(circuit_t *x) { tor_assert(x->magic == OR_CIRCUIT_MAGIC); return DOWNCAST(or_circuit_t, x); } static INLINE origin_circuit_t *TO_ORIGIN_CIRCUIT(circuit_t *x) { tor_assert(x->magic == ORIGIN_CIRCUIT_MAGIC); return DOWNCAST(origin_circuit_t, x); } /** Bitfield type: things that we're willing to use invalid routers for. */ typedef enum invalid_router_usage_t { ALLOW_INVALID_ENTRY =1, ALLOW_INVALID_EXIT =2, ALLOW_INVALID_MIDDLE =4, ALLOW_INVALID_RENDEZVOUS =8, ALLOW_INVALID_INTRODUCTION=16, } invalid_router_usage_t; /* limits for TCP send and recv buffer size used for constrained sockets */ #define MIN_CONSTRAINED_TCP_BUFFER 2048 #define MAX_CONSTRAINED_TCP_BUFFER 262144 /* 256k */ /** @name Isolation flags Ways to isolate client streams @{ */ /** Isolate based on destination port */ #define ISO_DESTPORT (1u<<0) /** Isolate based on destination address */ #define ISO_DESTADDR (1u<<1) /** Isolate based on SOCKS authentication */ #define ISO_SOCKSAUTH (1u<<2) /** Isolate based on client protocol choice */ #define ISO_CLIENTPROTO (1u<<3) /** Isolate based on client address */ #define ISO_CLIENTADDR (1u<<4) /** Isolate based on session group (always on). */ #define ISO_SESSIONGRP (1u<<5) /** Isolate based on newnym epoch (always on). */ #define ISO_NYM_EPOCH (1u<<6) /** Isolate all streams (Internal only). */ #define ISO_STREAM (1u<<7) /**@}*/ /** Default isolation level for ports. */ #define ISO_DEFAULT (ISO_CLIENTADDR|ISO_SOCKSAUTH|ISO_SESSIONGRP|ISO_NYM_EPOCH) /** Indicates that we haven't yet set a session group on a port_cfg_t. */ #define SESSION_GROUP_UNSET -1 /** Session group reserved for directory connections */ #define SESSION_GROUP_DIRCONN -2 /** Session group reserved for resolve requests launched by a controller */ #define SESSION_GROUP_CONTROL_RESOLVE -3 /** First automatically allocated session group number */ #define SESSION_GROUP_FIRST_AUTO -4 /** Configuration for a single port that we're listening on. */ typedef struct port_cfg_t { tor_addr_t addr; /**< The actual IP to listen on, if !is_unix_addr. */ int port; /**< The configured port, or CFG_AUTO_PORT to tell Tor to pick its * own port. */ uint8_t type; /**< One of CONN_TYPE_*_LISTENER */ unsigned is_unix_addr : 1; /**< True iff this is an AF_UNIX address. */ /* Client port types (socks, dns, trans, natd) only: */ uint8_t isolation_flags; /**< Zero or more isolation flags */ int session_group; /**< A session group, or -1 if this port is not in a * session group. */ /* Server port types (or, dir) only: */ unsigned int no_advertise : 1; unsigned int no_listen : 1; unsigned int all_addrs : 1; unsigned int ipv4_only : 1; unsigned int ipv6_only : 1; /* Unix sockets only: */ /** Path for an AF_UNIX address */ char unix_addr[FLEXIBLE_ARRAY_MEMBER]; } port_cfg_t; /** Ordinary configuration line. */ #define CONFIG_LINE_NORMAL 0 /** Appends to previous configuration for the same option, even if we * would ordinary replace it. */ #define CONFIG_LINE_APPEND 1 /* Removes all previous configuration for an option. */ #define CONFIG_LINE_CLEAR 2 /** A linked list of lines in a config file. */ typedef struct config_line_t { char *key; char *value; struct config_line_t *next; /** What special treatment (if any) does this line require? */ unsigned int command:2; /** If true, subsequent assignments to this linelist should replace * it, not extend it. Set only on the first item in a linelist in an * or_options_t. */ unsigned int fragile:1; } config_line_t; typedef struct routerset_t routerset_t; /** A magic value for the (Socks|OR|...)Port options below, telling Tor * to pick its own port. */ #define CFG_AUTO_PORT 0xc4005e /** Configuration options for a Tor process. */ typedef struct { uint32_t _magic; /** What should the tor process actually do? */ enum { CMD_RUN_TOR=0, CMD_LIST_FINGERPRINT, CMD_HASH_PASSWORD, CMD_VERIFY_CONFIG, CMD_RUN_UNITTESTS } command; const char *command_arg; /**< Argument for command-line option. */ config_line_t *Logs; /**< New-style list of configuration lines * for logs */ int LogTimeGranularity; /**< Log resolution in milliseconds. */ int LogMessageDomains; /**< Boolean: Should we log the domain(s) in which * each log message occurs? */ char *DebugLogFile; /**< Where to send verbose log messages. */ char *DataDirectory; /**< OR only: where to store long-term data. */ char *Nickname; /**< OR only: nickname of this onion router. */ char *Address; /**< OR only: configured address for this onion router. */ char *PidFile; /**< Where to store PID of Tor process. */ int DynamicDHGroups; /**< Dynamic generation of prime moduli for use in DH.*/ routerset_t *ExitNodes; /**< Structure containing nicknames, digests, * country codes and IP address patterns of ORs to * consider as exits. */ routerset_t *EntryNodes;/**< Structure containing nicknames, digests, * country codes and IP address patterns of ORs to * consider as entry points. */ int StrictNodes; /**< Boolean: When none of our EntryNodes or ExitNodes * are up, or we need to access a node in ExcludeNodes, * do we just fail instead? */ routerset_t *ExcludeNodes;/**< Structure containing nicknames, digests, * country codes and IP address patterns of ORs * not to use in circuits. But see StrictNodes * above. */ routerset_t *ExcludeExitNodes;/**< Structure containing nicknames, digests, * country codes and IP address patterns of * ORs not to consider as exits. */ /** Union of ExcludeNodes and ExcludeExitNodes */ routerset_t *_ExcludeExitNodesUnion; int DisableAllSwap; /**< Boolean: Attempt to call mlockall() on our * process for all current and future memory. */ /** List of "entry", "middle", "exit", "introduction", "rendezvous". */ smartlist_t *AllowInvalidNodes; /** Bitmask; derived from AllowInvalidNodes. */ invalid_router_usage_t _AllowInvalid; config_line_t *ExitPolicy; /**< Lists of exit policy components. */ int ExitPolicyRejectPrivate; /**< Should we not exit to local addresses? */ config_line_t *SocksPolicy; /**< Lists of socks policy components */ config_line_t *DirPolicy; /**< Lists of dir policy components */ /** Addresses to bind for listening for SOCKS connections. */ config_line_t *SocksListenAddress; /** Addresses to bind for listening for transparent pf/netfilter * connections. */ config_line_t *TransListenAddress; /** Addresses to bind for listening for transparent natd connections */ config_line_t *NATDListenAddress; /** Addresses to bind for listening for SOCKS connections. */ config_line_t *DNSListenAddress; /** Addresses to bind for listening for OR connections. */ config_line_t *ORListenAddress; /** Addresses to bind for listening for directory connections. */ config_line_t *DirListenAddress; /** Addresses to bind for listening for control connections. */ config_line_t *ControlListenAddress; /** Local address to bind outbound sockets */ char *OutboundBindAddress; /** Directory server only: which versions of * Tor should we tell users to run? */ config_line_t *RecommendedVersions; config_line_t *RecommendedClientVersions; config_line_t *RecommendedServerVersions; /** Whether dirservers refuse router descriptors with private IPs. */ int DirAllowPrivateAddresses; char *User; /**< Name of user to run Tor as. */ char *Group; /**< Name of group to run Tor as. */ config_line_t *ORPort; /**< Ports to listen on for OR connections. */ config_line_t *SocksPort; /**< Ports to listen on for SOCKS connections. */ /** Ports to listen on for transparent pf/netfilter connections. */ config_line_t *TransPort; config_line_t *NATDPort; /**< Ports to listen on for transparent natd * connections. */ config_line_t *ControlPort; /**< Port to listen on for control * connections. */ config_line_t *ControlSocket; /**< List of Unix Domain Sockets to listen on * for control connections. */ int ControlSocketsGroupWritable; /**< Boolean: Are control sockets g+rw? */ config_line_t *DirPort; /**< Port to listen on for directory connections. */ config_line_t *DNSPort; /**< Port to listen on for DNS requests. */ int AssumeReachable; /**< Whether to publish our descriptor regardless. */ int AuthoritativeDir; /**< Boolean: is this an authoritative directory? */ int V1AuthoritativeDir; /**< Boolean: is this an authoritative directory * for version 1 directories? */ int V2AuthoritativeDir; /**< Boolean: is this an authoritative directory * for version 2 directories? */ int V3AuthoritativeDir; /**< Boolean: is this an authoritative directory * for version 3 directories? */ int HSAuthoritativeDir; /**< Boolean: does this an authoritative directory * handle hidden service requests? */ int NamingAuthoritativeDir; /**< Boolean: is this an authoritative directory * that's willing to bind names? */ int VersioningAuthoritativeDir; /**< Boolean: is this an authoritative * directory that's willing to recommend * versions? */ int BridgeAuthoritativeDir; /**< Boolean: is this an authoritative directory * that aggregates bridge descriptors? */ /** If set on a bridge authority, it will answer requests on its dirport * for bridge statuses -- but only if the requests use this password. */ char *BridgePassword; /** If BridgePassword is set, this is a SHA256 digest of the basic http * authenticator for it. Used so we can do a time-independent comparison. */ char *_BridgePassword_AuthDigest; int UseBridges; /**< Boolean: should we start all circuits with a bridge? */ config_line_t *Bridges; /**< List of bootstrap bridge addresses. */ config_line_t *ClientTransportPlugin; /**< List of client transport plugins. */ config_line_t *ServerTransportPlugin; /**< List of client transport plugins. */ int BridgeRelay; /**< Boolean: are we acting as a bridge relay? We make * this explicit so we can change how we behave in the * future. */ /** Boolean: if we know the bridge's digest, should we get new * descriptors from the bridge authorities or from the bridge itself? */ int UpdateBridgesFromAuthority; int AvoidDiskWrites; /**< Boolean: should we never cache things to disk? * Not used yet. */ int ClientOnly; /**< Boolean: should we never evolve into a server role? */ /** To what authority types do we publish our descriptor? Choices are * "v1", "v2", "v3", "bridge", or "". */ smartlist_t *PublishServerDescriptor; /** A bitfield of authority types, derived from PublishServerDescriptor. */ dirinfo_type_t _PublishServerDescriptor; /** Boolean: do we publish hidden service descriptors to the HS auths? */ int PublishHidServDescriptors; int FetchServerDescriptors; /**< Do we fetch server descriptors as normal? */ int FetchHidServDescriptors; /**< and hidden service descriptors? */ int FetchV2Networkstatus; /**< Do we fetch v2 networkstatus documents when * we don't need to? */ int HidServDirectoryV2; /**< Do we participate in the HS DHT? */ int VoteOnHidServDirectoriesV2; /**< As a directory authority, vote on * assignment of the HSDir flag? */ int MinUptimeHidServDirectoryV2; /**< As directory authority, accept hidden * service directories after what time? */ int FetchUselessDescriptors; /**< Do we fetch non-running descriptors too? */ int AllDirActionsPrivate; /**< Should every directory action be sent * through a Tor circuit? */ /** Run in 'tor2web mode'? (I.e. only make client connections to hidden * services, and use a single hop for all hidden-service-related * circuits.) */ int Tor2webMode; /** Close hidden service client circuits immediately when they reach * the normal circuit-build timeout, even if they have already sent * an INTRODUCE1 cell on its way to the service. */ int CloseHSClientCircuitsImmediatelyOnTimeout; /** Close hidden-service-side rendezvous circuits immediately when * they reach the normal circuit-build timeout. */ int CloseHSServiceRendCircuitsImmediatelyOnTimeout; int ConnLimit; /**< Demanded minimum number of simultaneous connections. */ int _ConnLimit; /**< Maximum allowed number of simultaneous connections. */ int RunAsDaemon; /**< If true, run in the background. (Unix only) */ int FascistFirewall; /**< Whether to prefer ORs reachable on open ports. */ smartlist_t *FirewallPorts; /**< Which ports our firewall allows * (strings). */ config_line_t *ReachableAddresses; /**< IP:ports our firewall allows. */ config_line_t *ReachableORAddresses; /**< IP:ports for OR conns. */ config_line_t *ReachableDirAddresses; /**< IP:ports for Dir conns. */ int ConstrainedSockets; /**< Shrink xmit and recv socket buffers. */ uint64_t ConstrainedSockSize; /**< Size of constrained buffers. */ /** Whether we should drop exit streams from Tors that we don't know are * relays. One of "0" (never refuse), "1" (always refuse), or "-1" (do * what the consensus says, defaulting to 'refuse' if the consensus says * nothing). */ int RefuseUnknownExits; /** Application ports that require all nodes in circ to have sufficient * uptime. */ smartlist_t *LongLivedPorts; /** Application ports that are likely to be unencrypted and * unauthenticated; we reject requests for them to prevent the * user from screwing up and leaking plaintext secrets to an * observer somewhere on the Internet. */ smartlist_t *RejectPlaintextPorts; /** Related to RejectPlaintextPorts above, except this config option * controls whether we warn (in the log and via a controller status * event) every time a risky connection is attempted. */ smartlist_t *WarnPlaintextPorts; /** Should we try to reuse the same exit node for a given host */ smartlist_t *TrackHostExits; int TrackHostExitsExpire; /**< Number of seconds until we expire an * addressmap */ config_line_t *AddressMap; /**< List of address map directives. */ int AutomapHostsOnResolve; /**< If true, when we get a resolve request for a * hostname ending with one of the suffixes in * AutomapHostsSuffixes, map it to a * virtual address. */ smartlist_t *AutomapHostsSuffixes; /**< List of suffixes for * AutomapHostsOnResolve. */ int RendPostPeriod; /**< How often do we post each rendezvous service * descriptor? Remember to publish them independently. */ int KeepalivePeriod; /**< How often do we send padding cells to keep * connections alive? */ int SocksTimeout; /**< How long do we let a socks connection wait * unattached before we fail it? */ int LearnCircuitBuildTimeout; /**< If non-zero, we attempt to learn a value * for CircuitBuildTimeout based on timeout * history */ int CircuitBuildTimeout; /**< Cull non-open circuits that were born at * least this many seconds ago. Used until * adaptive algorithm learns a new value. */ int CircuitIdleTimeout; /**< Cull open clean circuits that were born * at least this many seconds ago. */ int CircuitStreamTimeout; /**< If non-zero, detach streams from circuits * and try a new circuit if the stream has been * waiting for this many seconds. If zero, use * our default internal timeout schedule. */ int MaxOnionsPending; /**< How many circuit CREATE requests do we allow * to wait simultaneously before we start dropping * them? */ int NewCircuitPeriod; /**< How long do we use a circuit before building * a new one? */ int MaxCircuitDirtiness; /**< Never use circs that were first used more than this interval ago. */ uint64_t BandwidthRate; /**< How much bandwidth, on average, are we willing * to use in a second? */ uint64_t BandwidthBurst; /**< How much bandwidth, at maximum, are we willing * to use in a second? */ uint64_t MaxAdvertisedBandwidth; /**< How much bandwidth are we willing to * tell people we have? */ uint64_t RelayBandwidthRate; /**< How much bandwidth, on average, are we * willing to use for all relayed conns? */ uint64_t RelayBandwidthBurst; /**< How much bandwidth, at maximum, will we * use in a second for all relayed conns? */ uint64_t PerConnBWRate; /**< Long-term bw on a single TLS conn, if set. */ uint64_t PerConnBWBurst; /**< Allowed burst on a single TLS conn, if set. */ int NumCPUs; /**< How many CPUs should we try to use? */ //int RunTesting; /**< If true, create testing circuits to measure how well the // * other ORs are running. */ config_line_t *RendConfigLines; /**< List of configuration lines * for rendezvous services. */ config_line_t *HidServAuth; /**< List of configuration lines for client-side * authorizations for hidden services */ char *ContactInfo; /**< Contact info to be published in the directory. */ int HeartbeatPeriod; /**< Log heartbeat messages after this many seconds * have passed. */ char *HTTPProxy; /**< hostname[:port] to use as http proxy, if any. */ tor_addr_t HTTPProxyAddr; /**< Parsed IPv4 addr for http proxy, if any. */ uint16_t HTTPProxyPort; /**< Parsed port for http proxy, if any. */ char *HTTPProxyAuthenticator; /**< username:password string, if any. */ char *HTTPSProxy; /**< hostname[:port] to use as https proxy, if any. */ tor_addr_t HTTPSProxyAddr; /**< Parsed addr for https proxy, if any. */ uint16_t HTTPSProxyPort; /**< Parsed port for https proxy, if any. */ char *HTTPSProxyAuthenticator; /**< username:password string, if any. */ char *Socks4Proxy; /**< hostname:port to use as a SOCKS4 proxy, if any. */ tor_addr_t Socks4ProxyAddr; /**< Derived from Socks4Proxy. */ uint16_t Socks4ProxyPort; /**< Derived from Socks4Proxy. */ char *Socks5Proxy; /**< hostname:port to use as a SOCKS5 proxy, if any. */ tor_addr_t Socks5ProxyAddr; /**< Derived from Sock5Proxy. */ uint16_t Socks5ProxyPort; /**< Derived from Socks5Proxy. */ char *Socks5ProxyUsername; /**< Username for SOCKS5 authentication, if any */ char *Socks5ProxyPassword; /**< Password for SOCKS5 authentication, if any */ /** List of configuration lines for replacement directory authorities. * If you just want to replace one class of authority at a time, * use the "Alternate*Authority" options below instead. */ config_line_t *DirServers; /** If set, use these main (currently v3) directory authorities and * not the default ones. */ config_line_t *AlternateDirAuthority; /** If set, use these bridge authorities and not the default one. */ config_line_t *AlternateBridgeAuthority; /** If set, use these HS authorities and not the default ones. */ config_line_t *AlternateHSAuthority; char *MyFamily; /**< Declared family for this OR. */ config_line_t *NodeFamilies; /**< List of config lines for * node families */ smartlist_t *NodeFamilySets; /**< List of parsed NodeFamilies values. */ config_line_t *AuthDirBadDir; /**< Address policy for descriptors to * mark as bad dir mirrors. */ config_line_t *AuthDirBadExit; /**< Address policy for descriptors to * mark as bad exits. */ config_line_t *AuthDirReject; /**< Address policy for descriptors to * reject. */ config_line_t *AuthDirInvalid; /**< Address policy for descriptors to * never mark as valid. */ /** @name AuthDir...CC * * Lists of country codes to mark as BadDir, BadExit, or Invalid, or to * reject entirely. * * @{ */ smartlist_t *AuthDirBadDirCCs; smartlist_t *AuthDirBadExitCCs; smartlist_t *AuthDirInvalidCCs; smartlist_t *AuthDirRejectCCs; /**@}*/ int AuthDirListBadDirs; /**< True iff we should list bad dirs, * and vote for all other dir mirrors as good. */ int AuthDirListBadExits; /**< True iff we should list bad exits, * and vote for all other exits as good. */ int AuthDirRejectUnlisted; /**< Boolean: do we reject all routers that * aren't named in our fingerprint file? */ int AuthDirMaxServersPerAddr; /**< Do not permit more than this * number of servers per IP address. */ int AuthDirMaxServersPerAuthAddr; /**< Do not permit more than this * number of servers per IP address shared * with an authority. */ /** If non-zero, always vote the Fast flag for any relay advertising * this amount of capacity or more. */ uint64_t AuthDirFastGuarantee; /** If non-zero, this advertised capacity or more is always sufficient * to satisfy the bandwidth requirement for the Guard flag. */ uint64_t AuthDirGuardBWGuarantee; char *AccountingStart; /**< How long is the accounting interval, and when * does it start? */ uint64_t AccountingMax; /**< How many bytes do we allow per accounting * interval before hibernation? 0 for "never * hibernate." */ /** Base64-encoded hash of accepted passwords for the control system. */ config_line_t *HashedControlPassword; /** As HashedControlPassword, but not saved. */ config_line_t *HashedControlSessionPassword; int CookieAuthentication; /**< Boolean: do we enable cookie-based auth for * the control system? */ char *CookieAuthFile; /**< Location of a cookie authentication file. */ int CookieAuthFileGroupReadable; /**< Boolean: Is the CookieAuthFile g+r? */ int LeaveStreamsUnattached; /**< Boolean: Does Tor attach new streams to * circuits itself (0), or does it expect a controller * to cope? (1) */ int DisablePredictedCircuits; /**< Boolean: does Tor preemptively * make circuits in the background (0), * or not (1)? */ /** Process specifier for a controller that ‘owns’ this Tor * instance. Tor will terminate if its owning controller does. */ char *OwningControllerProcess; int ShutdownWaitLength; /**< When we get a SIGINT and we're a server, how * long do we wait before exiting? */ char *SafeLogging; /**< Contains "relay", "1", "0" (meaning no scrubbing). */ /* Derived from SafeLogging */ enum { SAFELOG_SCRUB_ALL, SAFELOG_SCRUB_RELAY, SAFELOG_SCRUB_NONE } _SafeLogging; int SafeSocks; /**< Boolean: should we outright refuse application * connections that use socks4 or socks5-with-local-dns? */ #define LOG_PROTOCOL_WARN (get_options()->ProtocolWarnings ? \ LOG_WARN : LOG_INFO) int ProtocolWarnings; /**< Boolean: when other parties screw up the Tor * protocol, is it a warn or an info in our logs? */ int TestSocks; /**< Boolean: when we get a socks connection, do we loudly * log whether it was DNS-leaking or not? */ int HardwareAccel; /**< Boolean: Should we enable OpenSSL hardware * acceleration where available? */ /** Token Bucket Refill resolution in milliseconds. */ int TokenBucketRefillInterval; char *AccelName; /**< Optional hardware acceleration engine name. */ char *AccelDir; /**< Optional hardware acceleration engine search dir. */ int UseEntryGuards; /**< Boolean: Do we try to enter from a smallish number * of fixed nodes? */ int NumEntryGuards; /**< How many entry guards do we try to establish? */ int RephistTrackTime; /**< How many seconds do we keep rephist info? */ int FastFirstHopPK; /**< If Tor believes it is safe, should we save a third * of our PK time by sending CREATE_FAST cells? */ /** Should we always fetch our dir info on the mirror schedule (which * means directly from the authorities) no matter our other config? */ int FetchDirInfoEarly; /** Should we fetch our dir info at the start of the consensus period? */ int FetchDirInfoExtraEarly; char *VirtualAddrNetwork; /**< Address and mask to hand out for virtual * MAPADDRESS requests. */ int ServerDNSSearchDomains; /**< Boolean: If set, we don't force exit * addresses to be FQDNs, but rather search for them in * the local domains. */ int ServerDNSDetectHijacking; /**< Boolean: If true, check for DNS failure * hijacking. */ int ServerDNSRandomizeCase; /**< Boolean: Use the 0x20-hack to prevent * DNS poisoning attacks. */ char *ServerDNSResolvConfFile; /**< If provided, we configure our internal * resolver from the file here rather than from * /etc/resolv.conf (Unix) or the registry (Windows). */ char *DirPortFrontPage; /**< This is a full path to a file with an html disclaimer. This allows a server administrator to show that they're running Tor and anyone visiting their server will know this without any specialized knowledge. */ int DisableDebuggerAttachment; /**< Currently Linux only specific attempt to disable ptrace; needs BSD testing. */ /** Boolean: if set, we start even if our resolv.conf file is missing * or broken. */ int ServerDNSAllowBrokenConfig; /** Boolean: if set, then even connections to private addresses will get * rate-limited. */ int CountPrivateBandwidth; smartlist_t *ServerDNSTestAddresses; /**< A list of addresses that definitely * should be resolvable. Used for * testing our DNS server. */ int EnforceDistinctSubnets; /**< If true, don't allow multiple routers in the * same network zone in the same circuit. */ int TunnelDirConns; /**< If true, use BEGIN_DIR rather than BEGIN when * possible. */ int PreferTunneledDirConns; /**< If true, avoid dirservers that don't * support BEGIN_DIR, when possible. */ int PortForwarding; /**< If true, use NAT-PMP or UPnP to automatically * forward the DirPort and ORPort on the NAT device */ char *PortForwardingHelper; /** < Filename or full path of the port forwarding helper executable */ int AllowNonRFC953Hostnames; /**< If true, we allow connections to hostnames * with weird characters. */ /** If true, we try resolving hostnames with weird characters. */ int ServerDNSAllowNonRFC953Hostnames; /** If true, we try to download extra-info documents (and we serve them, * if we are a cache). For authorities, this is always true. */ int DownloadExtraInfo; /** If true, and we are acting as a relay, allow exit circuits even when * we are the first hop of a circuit. */ int AllowSingleHopExits; /** If true, don't allow relays with AllowSingleHopExits=1 to be used in * circuits that we build. */ int ExcludeSingleHopRelays; /** If true, and the controller tells us to use a one-hop circuit, and the * exit allows it, we use it. */ int AllowSingleHopCircuits; /** If true, we convert "www.google.com.foo.exit" addresses on the * socks/trans/natd ports into "www.google.com" addresses that * exit from the node "foo". Disabled by default since attacking * websites and exit relays can use it to manipulate your path * selection. */ int AllowDotExit; /** If true, we will warn if a user gives us only an IP address * instead of a hostname. */ int WarnUnsafeSocks; /** If true, the user wants us to collect statistics on clients * requesting network statuses from us as directory. */ int DirReqStatistics; /** If true, the user wants us to collect statistics on port usage. */ int ExitPortStatistics; /** If true, the user wants us to collect connection statistics. */ int ConnDirectionStatistics; /** If true, the user wants us to collect cell statistics. */ int CellStatistics; /** If true, the user wants us to collect statistics as entry node. */ int EntryStatistics; /** If true, include statistics file contents in extra-info documents. */ int ExtraInfoStatistics; /** If true, do not believe anybody who tells us that a domain resolves * to an internal address, or that an internal address has a PTR mapping. * Helps avoid some cross-site attacks. */ int ClientDNSRejectInternalAddresses; /** If true, do not accept any requests to connect to internal addresses * over randomly chosen exits. */ int ClientRejectInternalAddresses; /** The length of time that we think a consensus should be fresh. */ int V3AuthVotingInterval; /** The length of time we think it will take to distribute votes. */ int V3AuthVoteDelay; /** The length of time we think it will take to distribute signatures. */ int V3AuthDistDelay; /** The number of intervals we think a consensus should be valid. */ int V3AuthNIntervalsValid; /** Should advertise and sign consensuses with a legacy key, for key * migration purposes? */ int V3AuthUseLegacyKey; /** Location of bandwidth measurement file */ char *V3BandwidthsFile; /** Authority only: key=value pairs that we add to our networkstatus * consensus vote on the 'params' line. */ char *ConsensusParams; /** The length of time that we think an initial consensus should be fresh. * Only altered on testing networks. */ int TestingV3AuthInitialVotingInterval; /** The length of time we think it will take to distribute initial votes. * Only altered on testing networks. */ int TestingV3AuthInitialVoteDelay; /** The length of time we think it will take to distribute initial * signatures. Only altered on testing networks.*/ int TestingV3AuthInitialDistDelay; /** If an authority has been around for less than this amount of time, it * does not believe its reachability information is accurate. Only * altered on testing networks. */ int TestingAuthDirTimeToLearnReachability; /** Clients don't download any descriptor this recent, since it will * probably not have propagated to enough caches. Only altered on testing * networks. */ int TestingEstimatedDescriptorPropagationTime; /** If true, we take part in a testing network. Change the defaults of a * couple of other configuration options and allow to change the values * of certain configuration options. */ int TestingTorNetwork; /** File to check for a consensus networkstatus, if we don't have one * cached. */ char *FallbackNetworkstatusFile; /** If true, and we have GeoIP data, and we're a bridge, keep a per-country * count of how many client addresses have contacted us so that we can help * the bridge authority guess which countries have blocked access to us. */ int BridgeRecordUsageByCountry; /** Optionally, a file with GeoIP data. */ char *GeoIPFile; /** If true, SIGHUP should reload the torrc. Sometimes controllers want * to make this false. */ int ReloadTorrcOnSIGHUP; /* The main parameter for picking circuits within a connection. * * If this value is positive, when picking a cell to relay on a connection, * we always relay from the circuit whose weighted cell count is lowest. * Cells are weighted exponentially such that if one cell is sent * 'CircuitPriorityHalflife' seconds before another, it counts for half as * much. * * If this value is zero, we're disabling the cell-EWMA algorithm. * * If this value is negative, we're using the default approach * according to either Tor or a parameter set in the consensus. */ double CircuitPriorityHalflife; /** If true, do not enable IOCP on windows with bufferevents, even if * we think we could. */ int DisableIOCP; /** For testing only: will go away in 0.2.3.x. */ int _UseFilteringSSLBufferevents; /** Set to true if the TestingTorNetwork configuration option is set. * This is used so that options_validate() has a chance to realize that * the defaults have changed. */ int _UsingTestNetworkDefaults; /** If 1, we try to use microdescriptors to build circuits. If 0, we don't. * If -1, Tor decides. */ int UseMicrodescriptors; /** File where we should write the ControlPort. */ char *ControlPortWriteToFile; /** Should that file be group-readable? */ int ControlPortFileGroupReadable; #define MAX_MAX_CLIENT_CIRCUITS_PENDING 1024 /** Maximum number of non-open general-purpose origin circuits to allow at * once. */ int MaxClientCircuitsPending; /** If 1, we always send optimistic data when it's supported. If 0, we * never use it. If -1, we do what the consensus says. */ int OptimisticData; /** If 1, and we are using IOCP, we set the kernel socket SNDBUF and RCVBUF * to 0 to try to save kernel memory and avoid the dread "Out of buffers" * issue. */ int UserspaceIOCPBuffers; /** If 1, we accept and launch no external network connections, except on * control ports. */ int DisableNetwork; } or_options_t; /** Persistent state for an onion router, as saved to disk. */ typedef struct { uint32_t _magic; /** The time at which we next plan to write the state to the disk. Equal to * TIME_MAX if there are no savable changes, 0 if there are changes that * should be saved right away. */ time_t next_write; /** When was the state last written to disk? */ time_t LastWritten; /** Fields for accounting bandwidth use. */ time_t AccountingIntervalStart; uint64_t AccountingBytesReadInInterval; uint64_t AccountingBytesWrittenInInterval; int AccountingSecondsActive; int AccountingSecondsToReachSoftLimit; time_t AccountingSoftLimitHitAt; uint64_t AccountingBytesAtSoftLimit; uint64_t AccountingExpectedUsage; /** A list of Entry Guard-related configuration lines. */ config_line_t *EntryGuards; config_line_t *TransportProxies; /** These fields hold information on the history of bandwidth usage for * servers. The "Ends" fields hold the time when we last updated the * bandwidth usage. The "Interval" fields hold the granularity, in seconds, * of the entries of Values. The "Values" lists hold decimal string * representations of the number of bytes read or written in each * interval. The "Maxima" list holds decimal strings describing the highest * rate achieved during the interval. */ time_t BWHistoryReadEnds; int BWHistoryReadInterval; smartlist_t *BWHistoryReadValues; smartlist_t *BWHistoryReadMaxima; time_t BWHistoryWriteEnds; int BWHistoryWriteInterval; smartlist_t *BWHistoryWriteValues; smartlist_t *BWHistoryWriteMaxima; time_t BWHistoryDirReadEnds; int BWHistoryDirReadInterval; smartlist_t *BWHistoryDirReadValues; smartlist_t *BWHistoryDirReadMaxima; time_t BWHistoryDirWriteEnds; int BWHistoryDirWriteInterval; smartlist_t *BWHistoryDirWriteValues; smartlist_t *BWHistoryDirWriteMaxima; /** Build time histogram */ config_line_t * BuildtimeHistogram; unsigned int TotalBuildTimes; unsigned int CircuitBuildAbandonedCount; /** What version of Tor wrote this state file? */ char *TorVersion; /** Holds any unrecognized values we found in the state file, in the order * in which we found them. */ config_line_t *ExtraLines; /** When did we last rotate our onion key? "0" for 'no idea'. */ time_t LastRotatedOnionKey; } or_state_t; /** Change the next_write time of state to when, unless the * state is already scheduled to be written to disk earlier than when. */ static INLINE void or_state_mark_dirty(or_state_t *state, time_t when) { if (state->next_write > when) state->next_write = when; } #define MAX_SOCKS_REPLY_LEN 1024 #define MAX_SOCKS_ADDR_LEN 256 #define SOCKS_NO_AUTH 0x00 #define SOCKS_USER_PASS 0x02 /** Please open a TCP connection to this addr:port. */ #define SOCKS_COMMAND_CONNECT 0x01 /** Please turn this FQDN into an IP address, privately. */ #define SOCKS_COMMAND_RESOLVE 0xF0 /** Please turn this IP address into an FQDN, privately. */ #define SOCKS_COMMAND_RESOLVE_PTR 0xF1 #define SOCKS_COMMAND_IS_CONNECT(c) ((c)==SOCKS_COMMAND_CONNECT) #define SOCKS_COMMAND_IS_RESOLVE(c) ((c)==SOCKS_COMMAND_RESOLVE || \ (c)==SOCKS_COMMAND_RESOLVE_PTR) /** State of a SOCKS request from a user to an OP. Also used to encode other * information for non-socks user request (such as those on TransPort and * DNSPort) */ struct socks_request_t { /** Which version of SOCKS did the client use? One of "0, 4, 5" -- where * 0 means that no socks handshake ever took place, and this is just a * stub connection (e.g. see connection_ap_make_link()). */ uint8_t socks_version; /** If using socks5 authentication, which authentication type did we * negotiate? currently we support 0 (no authentication) and 2 * (username/password). */ uint8_t auth_type; /** What is this stream's goal? One of the SOCKS_COMMAND_* values */ uint8_t command; /** Which kind of listener created this stream? */ uint8_t listener_type; size_t replylen; /**< Length of reply. */ uint8_t reply[MAX_SOCKS_REPLY_LEN]; /**< Write an entry into this string if * we want to specify our own socks reply, * rather than using the default socks4 or * socks5 socks reply. We use this for the * two-stage socks5 handshake. */ char address[MAX_SOCKS_ADDR_LEN]; /**< What address did the client ask to connect to/resolve? */ uint16_t port; /**< What port did the client ask to connect to? */ unsigned int has_finished : 1; /**< Has the SOCKS handshake finished? Used to * make sure we send back a socks reply for * every connection. */ unsigned int got_auth : 1; /**< Have we received any authentication data? */ /** Number of bytes in username; 0 if username is NULL */ size_t usernamelen; /** Number of bytes in password; 0 if password is NULL */ uint8_t passwordlen; /** The negotiated username value if any (for socks5), or the entire * authentication string (for socks4). This value is NOT nul-terminated; * see usernamelen for its length. */ char *username; /** The negotiated password value if any (for socks5). This value is NOT * nul-terminated; see passwordlen for its length. */ char *password; }; /********************************* circuitbuild.c **********************/ /** How many hops does a general-purpose circuit have by default? */ #define DEFAULT_ROUTE_LEN 3 /* Circuit Build Timeout "public" structures. */ /** Precision multiplier for the Bw weights */ #define BW_WEIGHT_SCALE 10000 #define BW_MIN_WEIGHT_SCALE 1 #define BW_MAX_WEIGHT_SCALE INT32_MAX /** Total size of the circuit timeout history to accumulate. * 1000 is approx 2.5 days worth of continual-use circuits. */ #define CBT_NCIRCUITS_TO_OBSERVE 1000 /** Width of the histogram bins in milliseconds */ #define CBT_BIN_WIDTH ((build_time_t)50) /** Number of modes to use in the weighted-avg computation of Xm */ #define CBT_DEFAULT_NUM_XM_MODES 3 #define CBT_MIN_NUM_XM_MODES 1 #define CBT_MAX_NUM_XM_MODES 20 /** A build_time_t is milliseconds */ typedef uint32_t build_time_t; /** * CBT_BUILD_ABANDONED is our flag value to represent a force-closed * circuit (Aka a 'right-censored' pareto value). */ #define CBT_BUILD_ABANDONED ((build_time_t)(INT32_MAX-1)) #define CBT_BUILD_TIME_MAX ((build_time_t)(INT32_MAX)) /** Save state every 10 circuits */ #define CBT_SAVE_STATE_EVERY 10 /* Circuit build times consensus parameters */ /** * How long to wait before actually closing circuits that take too long to * build in terms of CDF quantile. */ #define CBT_DEFAULT_CLOSE_QUANTILE 95 #define CBT_MIN_CLOSE_QUANTILE CBT_MIN_QUANTILE_CUTOFF #define CBT_MAX_CLOSE_QUANTILE CBT_MAX_QUANTILE_CUTOFF /** * How many circuits count as recent when considering if the * connection has gone gimpy or changed. */ #define CBT_DEFAULT_RECENT_CIRCUITS 20 #define CBT_MIN_RECENT_CIRCUITS 3 #define CBT_MAX_RECENT_CIRCUITS 1000 /** * Maximum count of timeouts that finish the first hop in the past * RECENT_CIRCUITS before calculating a new timeout. * * This tells us whether to abandon timeout history and set * the timeout back to whatever circuit_build_times_get_initial_timeout() * gives us. */ #define CBT_DEFAULT_MAX_RECENT_TIMEOUT_COUNT (CBT_DEFAULT_RECENT_CIRCUITS*9/10) #define CBT_MIN_MAX_RECENT_TIMEOUT_COUNT 3 #define CBT_MAX_MAX_RECENT_TIMEOUT_COUNT 10000 /** Minimum circuits before estimating a timeout */ #define CBT_DEFAULT_MIN_CIRCUITS_TO_OBSERVE 100 #define CBT_MIN_MIN_CIRCUITS_TO_OBSERVE 1 #define CBT_MAX_MIN_CIRCUITS_TO_OBSERVE 10000 /** Cutoff percentile on the CDF for our timeout estimation. */ #define CBT_DEFAULT_QUANTILE_CUTOFF 80 #define CBT_MIN_QUANTILE_CUTOFF 10 #define CBT_MAX_QUANTILE_CUTOFF 99 double circuit_build_times_quantile_cutoff(void); /** How often in seconds should we build a test circuit */ #define CBT_DEFAULT_TEST_FREQUENCY 60 #define CBT_MIN_TEST_FREQUENCY 1 #define CBT_MAX_TEST_FREQUENCY INT32_MAX /** Lowest allowable value for CircuitBuildTimeout in milliseconds */ #define CBT_DEFAULT_TIMEOUT_MIN_VALUE (1500) #define CBT_MIN_TIMEOUT_MIN_VALUE 500 #define CBT_MAX_TIMEOUT_MIN_VALUE INT32_MAX /** Initial circuit build timeout in milliseconds */ #define CBT_DEFAULT_TIMEOUT_INITIAL_VALUE (60*1000) #define CBT_MIN_TIMEOUT_INITIAL_VALUE CBT_MIN_TIMEOUT_MIN_VALUE #define CBT_MAX_TIMEOUT_INITIAL_VALUE INT32_MAX int32_t circuit_build_times_initial_timeout(void); #if CBT_DEFAULT_MAX_RECENT_TIMEOUT_COUNT < CBT_MIN_MAX_RECENT_TIMEOUT_COUNT #error "RECENT_CIRCUITS is set too low." #endif /** Information about the state of our local network connection */ typedef struct { /** The timestamp we last completed a TLS handshake or received a cell */ time_t network_last_live; /** If the network is not live, how many timeouts has this caused? */ int nonlive_timeouts; /** Circular array of circuits that have made it to the first hop. Slot is * 1 if circuit timed out, 0 if circuit succeeded */ int8_t *timeouts_after_firsthop; /** Number of elements allocated for the above array */ int num_recent_circs; /** Index into circular array. */ int after_firsthop_idx; } network_liveness_t; /** Structure for circuit build times history */ typedef struct { /** The circular array of recorded build times in milliseconds */ build_time_t circuit_build_times[CBT_NCIRCUITS_TO_OBSERVE]; /** Current index in the circuit_build_times circular array */ int build_times_idx; /** Total number of build times accumulated. Max CBT_NCIRCUITS_TO_OBSERVE */ int total_build_times; /** Information about the state of our local network connection */ network_liveness_t liveness; /** Last time we built a circuit. Used to decide to build new test circs */ time_t last_circ_at; /** "Minimum" value of our pareto distribution (actually mode) */ build_time_t Xm; /** alpha exponent for pareto dist. */ double alpha; /** Have we computed a timeout? */ int have_computed_timeout; /** The exact value for that timeout in milliseconds. Stored as a double * to maintain precision from calculations to and from quantile value. */ double timeout_ms; /** How long we wait before actually closing the circuit. */ double close_ms; } circuit_build_times_t; /********************************* config.c ***************************/ /** An error from options_trial_assign() or options_init_from_string(). */ typedef enum setopt_err_t { SETOPT_OK = 0, SETOPT_ERR_MISC = -1, SETOPT_ERR_PARSE = -2, SETOPT_ERR_TRANSITION = -3, SETOPT_ERR_SETTING = -4, } setopt_err_t; /********************************* connection_edge.c *************************/ /** Enumerates possible origins of a client-side address mapping. */ typedef enum { /** We're remapping this address because the controller told us to. */ ADDRMAPSRC_CONTROLLER, /** We're remapping this address because of an AutomapHostsOnResolve * configuration. */ ADDRMAPSRC_AUTOMAP, /** We're remapping this address because our configuration (via torrc, the * command line, or a SETCONF command) told us to. */ ADDRMAPSRC_TORRC, /** We're remapping this address because we have TrackHostExit configured, * and we want to remember to use the same exit next time. */ ADDRMAPSRC_TRACKEXIT, /** We're remapping this address because we got a DNS resolution from a * Tor server that told us what its value was. */ ADDRMAPSRC_DNS, } addressmap_entry_source_t; /********************************* control.c ***************************/ /** Used to indicate the type of a circuit event passed to the controller. * The various types are defined in control-spec.txt */ typedef enum circuit_status_event_t { CIRC_EVENT_LAUNCHED = 0, CIRC_EVENT_BUILT = 1, CIRC_EVENT_EXTENDED = 2, CIRC_EVENT_FAILED = 3, CIRC_EVENT_CLOSED = 4, } circuit_status_event_t; /** Used to indicate the type of a CIRC_MINOR event passed to the controller. * The various types are defined in control-spec.txt . */ typedef enum circuit_status_minor_event_t { CIRC_MINOR_EVENT_PURPOSE_CHANGED, CIRC_MINOR_EVENT_CANNIBALIZED, } circuit_status_minor_event_t; /** Used to indicate the type of a stream event passed to the controller. * The various types are defined in control-spec.txt */ typedef enum stream_status_event_t { STREAM_EVENT_SENT_CONNECT = 0, STREAM_EVENT_SENT_RESOLVE = 1, STREAM_EVENT_SUCCEEDED = 2, STREAM_EVENT_FAILED = 3, STREAM_EVENT_CLOSED = 4, STREAM_EVENT_NEW = 5, STREAM_EVENT_NEW_RESOLVE = 6, STREAM_EVENT_FAILED_RETRIABLE = 7, STREAM_EVENT_REMAP = 8 } stream_status_event_t; /** Used to indicate the type of an OR connection event passed to the * controller. The various types are defined in control-spec.txt */ typedef enum or_conn_status_event_t { OR_CONN_EVENT_LAUNCHED = 0, OR_CONN_EVENT_CONNECTED = 1, OR_CONN_EVENT_FAILED = 2, OR_CONN_EVENT_CLOSED = 3, OR_CONN_EVENT_NEW = 4, } or_conn_status_event_t; /** Used to indicate the type of a buildtime event */ typedef enum buildtimeout_set_event_t { BUILDTIMEOUT_SET_EVENT_COMPUTED = 0, BUILDTIMEOUT_SET_EVENT_RESET = 1, BUILDTIMEOUT_SET_EVENT_SUSPENDED = 2, BUILDTIMEOUT_SET_EVENT_DISCARD = 3, BUILDTIMEOUT_SET_EVENT_RESUME = 4 } buildtimeout_set_event_t; /** Execute the statement stmt, which may log events concerning the * connection conn. To prevent infinite loops, disable log messages * being sent to controllers if conn is a control connection. * * Stmt must not contain any return or goto statements. */ #define CONN_LOG_PROTECT(conn, stmt) \ STMT_BEGIN \ int _log_conn_is_control; \ tor_assert(conn); \ _log_conn_is_control = (conn->type == CONN_TYPE_CONTROL); \ if (_log_conn_is_control) \ disable_control_logging(); \ STMT_BEGIN stmt; STMT_END; \ if (_log_conn_is_control) \ enable_control_logging(); \ STMT_END /** Enum describing various stages of bootstrapping, for use with controller * bootstrap status events. The values range from 0 to 100. */ typedef enum { BOOTSTRAP_STATUS_UNDEF=-1, BOOTSTRAP_STATUS_STARTING=0, BOOTSTRAP_STATUS_CONN_DIR=5, BOOTSTRAP_STATUS_HANDSHAKE=-2, BOOTSTRAP_STATUS_HANDSHAKE_DIR=10, BOOTSTRAP_STATUS_ONEHOP_CREATE=15, BOOTSTRAP_STATUS_REQUESTING_STATUS=20, BOOTSTRAP_STATUS_LOADING_STATUS=25, BOOTSTRAP_STATUS_LOADING_KEYS=40, BOOTSTRAP_STATUS_REQUESTING_DESCRIPTORS=45, BOOTSTRAP_STATUS_LOADING_DESCRIPTORS=50, BOOTSTRAP_STATUS_CONN_OR=80, BOOTSTRAP_STATUS_HANDSHAKE_OR=85, BOOTSTRAP_STATUS_CIRCUIT_CREATE=90, BOOTSTRAP_STATUS_DONE=100 } bootstrap_status_t; /********************************* directory.c ***************************/ /** A pair of digests created by dir_split_resource_info_fingerprint_pairs() */ typedef struct { char first[DIGEST_LEN]; char second[DIGEST_LEN]; } fp_pair_t; /********************************* dirserv.c ***************************/ /** An enum to describe what format we're generating a routerstatus line in. */ typedef enum { /** For use in a v2 opinion */ NS_V2, /** For use in a consensus networkstatus document (ns flavor) */ NS_V3_CONSENSUS, /** For use in a vote networkstatus document */ NS_V3_VOTE, /** For passing to the controlport in response to a GETINFO request */ NS_CONTROL_PORT, /** For use in a consensus networkstatus document (microdesc flavor) */ NS_V3_CONSENSUS_MICRODESC } routerstatus_format_type_t; #ifdef DIRSERV_PRIVATE typedef struct measured_bw_line_t { char node_id[DIGEST_LEN]; char node_hex[MAX_HEX_NICKNAME_LEN+1]; long int bw; } measured_bw_line_t; #endif /********************************* dirvote.c ************************/ /** Describes the schedule by which votes should be generated. */ typedef struct vote_timing_t { /** Length in seconds between one consensus becoming valid and the next * becoming valid. */ int vote_interval; /** For how many intervals is a consensus valid? */ int n_intervals_valid; /** Time in seconds allowed to propagate votes */ int vote_delay; /** Time in seconds allowed to propagate signatures */ int dist_delay; } vote_timing_t; /********************************* geoip.c **************************/ /** Round all GeoIP results to the next multiple of this value, to avoid * leaking information. */ #define DIR_RECORD_USAGE_GRANULARITY 8 /** Time interval: Flush geoip data to disk this often. */ #define DIR_ENTRY_RECORD_USAGE_RETAIN_IPS (24*60*60) /** How long do we have to have observed per-country request history before * we are willing to talk about it? */ #define DIR_RECORD_USAGE_MIN_OBSERVATION_TIME (12*60*60) /** Indicates an action that we might be noting geoip statistics on. * Note that if we're noticing CONNECT, we're a bridge, and if we're noticing * the others, we're not. */ typedef enum { /** We've noticed a connection as a bridge relay or entry guard. */ GEOIP_CLIENT_CONNECT = 0, /** We've served a networkstatus consensus as a directory server. */ GEOIP_CLIENT_NETWORKSTATUS = 1, /** We've served a v2 networkstatus consensus as a directory server. */ GEOIP_CLIENT_NETWORKSTATUS_V2 = 2, } geoip_client_action_t; /** Indicates either a positive reply or a reason for rejectng a network * status request that will be included in geoip statistics. */ typedef enum { /** Request is answered successfully. */ GEOIP_SUCCESS = 0, /** V3 network status is not signed by a sufficient number of requested * authorities. */ GEOIP_REJECT_NOT_ENOUGH_SIGS = 1, /** Requested network status object is unavailable. */ GEOIP_REJECT_UNAVAILABLE = 2, /** Requested network status not found. */ GEOIP_REJECT_NOT_FOUND = 3, /** Network status has not been modified since If-Modified-Since time. */ GEOIP_REJECT_NOT_MODIFIED = 4, /** Directory is busy. */ GEOIP_REJECT_BUSY = 5, } geoip_ns_response_t; #define GEOIP_NS_RESPONSE_NUM 6 /** Directory requests that we are measuring can be either direct or * tunneled. */ typedef enum { DIRREQ_DIRECT = 0, DIRREQ_TUNNELED = 1, } dirreq_type_t; /** Possible states for either direct or tunneled directory requests that * are relevant for determining network status download times. */ typedef enum { /** Found that the client requests a network status; applies to both * direct and tunneled requests; initial state of a request that we are * measuring. */ DIRREQ_IS_FOR_NETWORK_STATUS = 0, /** Finished writing a network status to the directory connection; * applies to both direct and tunneled requests; completes a direct * request. */ DIRREQ_FLUSHING_DIR_CONN_FINISHED = 1, /** END cell sent to circuit that initiated a tunneled request. */ DIRREQ_END_CELL_SENT = 2, /** Flushed last cell from queue of the circuit that initiated a * tunneled request to the outbuf of the OR connection. */ DIRREQ_CIRC_QUEUE_FLUSHED = 3, /** Flushed last byte from buffer of the OR connection belonging to the * circuit that initiated a tunneled request; completes a tunneled * request. */ DIRREQ_OR_CONN_BUFFER_FLUSHED = 4 } dirreq_state_t; #define WRITE_STATS_INTERVAL (24*60*60) /********************************* microdesc.c *************************/ typedef struct microdesc_cache_t microdesc_cache_t; /********************************* networkstatus.c *********************/ /** Location where we found a v2 networkstatus. */ typedef enum { NS_FROM_CACHE, NS_FROM_DIR_BY_FP, NS_FROM_DIR_ALL, NS_GENERATED } v2_networkstatus_source_t; /** Possible statuses of a version of Tor, given opinions from the directory * servers. */ typedef enum version_status_t { VS_RECOMMENDED=0, /**< This version is listed as recommended. */ VS_OLD=1, /**< This version is older than any recommended version. */ VS_NEW=2, /**< This version is newer than any recommended version. */ VS_NEW_IN_SERIES=3, /**< This version is newer than any recommended version * in its series, but later recommended versions exist. */ VS_UNRECOMMENDED=4, /**< This version is not recommended (general case). */ VS_EMPTY=5, /**< The version list was empty; no agreed-on versions. */ VS_UNKNOWN, /**< We have no idea. */ } version_status_t; /********************************* policies.c ************************/ /** Outcome of applying an address policy to an address. */ typedef enum { /** The address was accepted */ ADDR_POLICY_ACCEPTED=0, /** The address was rejected */ ADDR_POLICY_REJECTED=-1, /** Part of the address was unknown, but as far as we can tell, it was * accepted. */ ADDR_POLICY_PROBABLY_ACCEPTED=1, /** Part of the address was unknown, but as far as we can tell, it was * rejected. */ ADDR_POLICY_PROBABLY_REJECTED=2, } addr_policy_result_t; /********************************* rephist.c ***************************/ /** Possible public/private key operations in Tor: used to keep track of where * we're spending our time. */ typedef enum { SIGN_DIR, SIGN_RTR, VERIFY_DIR, VERIFY_RTR, ENC_ONIONSKIN, DEC_ONIONSKIN, TLS_HANDSHAKE_C, TLS_HANDSHAKE_S, REND_CLIENT, REND_MID, REND_SERVER, } pk_op_t; /********************************* rendcommon.c ***************************/ /** Hidden-service side configuration of client authorization. */ typedef struct rend_authorized_client_t { char *client_name; char descriptor_cookie[REND_DESC_COOKIE_LEN]; crypto_pk_t *client_key; } rend_authorized_client_t; /** ASCII-encoded v2 hidden service descriptor. */ typedef struct rend_encoded_v2_service_descriptor_t { char desc_id[DIGEST_LEN]; /**< Descriptor ID. */ char *desc_str; /**< Descriptor string. */ } rend_encoded_v2_service_descriptor_t; /** The maximum number of non-circuit-build-timeout failures a hidden * service client will tolerate while trying to build a circuit to an * introduction point. See also rend_intro_point_t.unreachable_count. */ #define MAX_INTRO_POINT_REACHABILITY_FAILURES 5 /** The maximum number of distinct INTRODUCE2 cells which a hidden * service's introduction point will receive before it begins to * expire. * * XXX023 Is this number at all sane? */ #define INTRO_POINT_LIFETIME_INTRODUCTIONS 16384 /** The minimum number of seconds that an introduction point will last * before expiring due to old age. (If it receives * INTRO_POINT_LIFETIME_INTRODUCTIONS INTRODUCE2 cells, it may expire * sooner.) * * XXX023 Should this be configurable? */ #define INTRO_POINT_LIFETIME_MIN_SECONDS 18*60*60 /** The maximum number of seconds that an introduction point will last * before expiring due to old age. * * XXX023 Should this be configurable? */ #define INTRO_POINT_LIFETIME_MAX_SECONDS 24*60*60 /** Introduction point information. Used both in rend_service_t (on * the service side) and in rend_service_descriptor_t (on both the * client and service side). */ typedef struct rend_intro_point_t { extend_info_t *extend_info; /**< Extend info of this introduction point. */ crypto_pk_t *intro_key; /**< Introduction key that replaces the service * key, if this descriptor is V2. */ /** (Client side only) Flag indicating that a timeout has occurred * after sending an INTRODUCE cell to this intro point. After a * timeout, an intro point should not be tried again during the same * hidden service connection attempt, but it may be tried again * during a future connection attempt. */ unsigned int timed_out : 1; /** (Client side only) The number of times we have failed to build a * circuit to this intro point for some reason other than our * circuit-build timeout. See also MAX_INTRO_POINT_REACHABILITY_FAILURES. */ unsigned int unreachable_count : 3; /** (Service side only) Flag indicating that this intro point was * included in the last HS descriptor we generated. */ unsigned int listed_in_last_desc : 1; /** (Service side only) Flag indicating that * rend_service_note_removing_intro_point has been called for this * intro point. */ unsigned int rend_service_note_removing_intro_point_called : 1; /** (Service side only) A digestmap recording the INTRODUCE2 cells * this intro point's circuit has received. Each key is the digest * of the RSA-encrypted part of a received INTRODUCE2 cell; each * value is a pointer to the time_t at which the cell was received. * This digestmap is used to prevent replay attacks. */ digestmap_t *accepted_intro_rsa_parts; /** (Service side only) The time at which this intro point was first * published, or -1 if this intro point has not yet been * published. */ time_t time_published; /** (Service side only) The time at which this intro point should * (start to) expire, or -1 if we haven't decided when this intro * point should expire. */ time_t time_to_expire; /** (Service side only) The time at which we decided that this intro * point should start expiring, or -1 if this intro point is not yet * expiring. * * This field also serves as a flag to indicate that we have decided * to expire this intro point, in case intro_point_should_expire_now * flaps (perhaps due to a clock jump; perhaps due to other * weirdness, or even a (present or future) bug). */ time_t time_expiring; } rend_intro_point_t; /** Information used to connect to a hidden service. Used on both the * service side and the client side. */ typedef struct rend_service_descriptor_t { crypto_pk_t *pk; /**< This service's public key. */ int version; /**< Version of the descriptor format: 0 or 2. */ time_t timestamp; /**< Time when the descriptor was generated. */ uint16_t protocols; /**< Bitmask: which rendezvous protocols are supported? * (We allow bits '0', '1', and '2' to be set.) */ /** List of the service's introduction points. Elements are removed if * introduction attempts fail. */ smartlist_t *intro_nodes; /** Has descriptor been uploaded to all hidden service directories? */ int all_uploads_performed; /** List of hidden service directories to which an upload request for * this descriptor could be sent. Smartlist exists only when at least one * of the previous upload requests failed (otherwise it's not important * to know which uploads succeeded and which not). */ smartlist_t *successful_uploads; } rend_service_descriptor_t; /** A cached rendezvous descriptor. */ typedef struct rend_cache_entry_t { size_t len; /**< Length of desc */ time_t received; /**< When was the descriptor received? */ char *desc; /**< Service descriptor */ rend_service_descriptor_t *parsed; /**< Parsed value of 'desc' */ } rend_cache_entry_t; /********************************* routerlist.c ***************************/ /** Represents information about a single trusted directory server. */ typedef struct trusted_dir_server_t { char *description; char *nickname; char *address; /**< Hostname. */ uint32_t addr; /**< IPv4 address. */ uint16_t dir_port; /**< Directory port. */ uint16_t or_port; /**< OR port: Used for tunneling connections. */ char digest[DIGEST_LEN]; /**< Digest of identity key. */ char v3_identity_digest[DIGEST_LEN]; /**< Digest of v3 (authority only, * high-security) identity key. */ unsigned int is_running:1; /**< True iff we think this server is running. */ /** True iff this server has accepted the most recent server descriptor * we tried to upload to it. */ unsigned int has_accepted_serverdesc:1; /** What kind of authority is this? (Bitfield.) */ dirinfo_type_t type; download_status_t v2_ns_dl_status; /**< Status of downloading this server's * v2 network status. */ time_t addr_current_at; /**< When was the document that we derived the * address information from published? */ routerstatus_t fake_status; /**< Used when we need to pass this trusted * dir_server_t to directory_initiate_command_* * as a routerstatus_t. Not updated by the * router-status management code! **/ } trusted_dir_server_t; #define ROUTER_REQUIRED_MIN_BANDWIDTH (20*1024) #define ROUTER_MAX_DECLARED_BANDWIDTH INT32_MAX /* Flags for pick_directory_server() and pick_trusteddirserver(). */ /** Flag to indicate that we should not automatically be willing to use * ourself to answer a directory request. * Passed to router_pick_directory_server (et al).*/ #define PDS_ALLOW_SELF (1<<0) /** Flag to indicate that if no servers seem to be up, we should mark all * directory servers as up and try again. * Passed to router_pick_directory_server (et al).*/ #define PDS_RETRY_IF_NO_SERVERS (1<<1) /** Flag to indicate that we should not exclude directory servers that * our ReachableAddress settings would exclude. This usually means that * we're going to connect to the server over Tor, and so we don't need to * worry about our firewall telling us we can't. * Passed to router_pick_directory_server (et al).*/ #define PDS_IGNORE_FASCISTFIREWALL (1<<2) /** Flag to indicate that we should not use any directory authority to which * we have an existing directory connection for downloading server descriptors * or extrainfo documents. * * Passed to router_pick_directory_server (et al) * * [XXXX NOTE: This option is only implemented for pick_trusteddirserver, * not pick_directory_server. If we make it work on pick_directory_server * too, we could conservatively make it only prevent multiple fetches to * the same authority, or we could aggressively make it prevent multiple * fetches to _any_ single directory server.] */ #define PDS_NO_EXISTING_SERVERDESC_FETCH (1<<3) #define PDS_NO_EXISTING_MICRODESC_FETCH (1<<4) #define _PDS_PREFER_TUNNELED_DIR_CONNS (1<<16) /** Possible ways to weight routers when choosing one randomly. See * routerlist_sl_choose_by_bandwidth() for more information.*/ typedef enum bandwidth_weight_rule_t { NO_WEIGHTING, WEIGHT_FOR_EXIT, WEIGHT_FOR_MID, WEIGHT_FOR_GUARD, WEIGHT_FOR_DIR } bandwidth_weight_rule_t; /** Flags to be passed to control router_choose_random_node() to indicate what * kind of nodes to pick according to what algorithm. */ typedef enum { CRN_NEED_UPTIME = 1<<0, CRN_NEED_CAPACITY = 1<<1, CRN_NEED_GUARD = 1<<2, CRN_ALLOW_INVALID = 1<<3, /* XXXX not used, apparently. */ CRN_WEIGHT_AS_EXIT = 1<<5, CRN_NEED_DESC = 1<<6 } router_crn_flags_t; /** Return value for router_add_to_routerlist() and dirserv_add_descriptor() */ typedef enum was_router_added_t { ROUTER_ADDED_SUCCESSFULLY = 1, ROUTER_ADDED_NOTIFY_GENERATOR = 0, ROUTER_BAD_EI = -1, ROUTER_WAS_NOT_NEW = -2, ROUTER_NOT_IN_CONSENSUS = -3, ROUTER_NOT_IN_CONSENSUS_OR_NETWORKSTATUS = -4, ROUTER_AUTHDIR_REJECTS = -5, ROUTER_WAS_NOT_WANTED = -6 } was_router_added_t; /********************************* routerparse.c ************************/ #define MAX_STATUS_TAG_LEN 32 /** Structure to hold parsed Tor versions. This is a little messier * than we would like it to be, because we changed version schemes with 0.1.0. * * See version-spec.txt for the whole business. */ typedef struct tor_version_t { int major; int minor; int micro; /** Release status. For version in the post-0.1 format, this is always * VER_RELEASE. */ enum { VER_PRE=0, VER_RC=1, VER_RELEASE=2, } status; int patchlevel; char status_tag[MAX_STATUS_TAG_LEN]; int svn_revision; int git_tag_len; char git_tag[DIGEST_LEN]; } tor_version_t; #endif